Fix null parameter

CHANGELOG.md

@@ -1,22 +1,29 @@
-## 0.1.10
-Released on 2018-03-15.
-- Fix crash when there are no required parameters. [#107](https://github.com/Azure/openapi-diff/issues/107)
+# Changelog
 
-## 0.1.9
-Released on 2017-10-23.
-- Fix publishing issue of 0.1.8 where some dlls were missing.
+## 0.1.11 Released on 2018-05-14
 
-## 0.1.8
-Released on 2017-10-20.
-- Updating to use AutoRest 2. This solves [#105](https://github.com/Azure/openapi-diff/issues/105)
+* Fix crash on no operation parameters . [#86](https://github.com/Azure/openapi-diff/issues/86)
 
-## 0.1.7
-Released on 2017-08-10.
-- Chaining the promises upto `compare` method and gracefully exiting application [#88](https://github.com/Azure/openapi-diff/issues/88)
+## 0.1.10 Released on 2018-03-15
 
-## 0.1.x
-Released on 2017-07-18. All issues associated with this release can be found using this filter [Sprint-103](https://github.com/Azure/openapi-diff/issues?q=label%3ASprint-103+is%3Aclosed) [Sprint-104](https://github.com/Azure/openapi-diff/issues?utf8=%E2%9C%93&q=label%3ASprint-104%20is%3Aclosed)
+* Fix crash when there are no required parameters. [#107](https://github.com/Azure/openapi-diff/issues/107)
 
-#### Added
-- Initial release of oad.
-  - Added by [Vishrut Shah](https://github.com/vishrutshah).
+## 0.1.9 Released on 2017-10-23
+
+* Fix publishing issue of 0.1.8 where some dlls were missing.
+
+## 0.1.8 Released on 2017-10-20
+
+* Updating to use AutoRest 2. This solves [#105](https://github.com/Azure/openapi-diff/issues/105)
+
+## 0.1.7 Released on 2017-08-10.
+
+* Chaining the promises upto `compare` method and gracefully exiting application [#88](https://github.com/Azure/openapi-diff/issues/88)
+
+## 0.1.x Released on 2017-07-18.
+
+* All issues associated with this release can be found using this filter [Sprint-103](https://github.com/Azure/openapi-diff/issues?q=label%3ASprint-103+is%3Aclosed) [Sprint-104](https://github.com/Azure/openapi-diff/issues?utf8=%E2%9C%93&q=label%3ASprint-104%20is%3Aclosed)
+
+## Added
+
+* Initial release of oad.

README.md

@@ -1,10 +1,12 @@
-### How to install
-```
-npm install -g [email protected]
-```
+# How to install
 
-### Command Usage
+```javascript
+npm install -g [email protected]
 ```
+
+## git Usage
+
+```bash
 vishrut@visshamac openapi-diff $ oad compare --help
 Commands:
   compare <old-spec> <new-spec>  Compares old and new open api specification for
@@ -21,33 +23,41 @@ Options:
   -j, --inJson       A boolean flag indicating whether output format of the
                      messages is json.                 [boolean] [default: true]
   -h, --help         Show help                                         [boolean]
-
 ```
 
 ## Build dependencies
-- [Node](https://nodejs.org) (7.10.0 or higher)
-- [Node Package Manager](https://www.npmjs.com/package/npm)
-- [.NET CLI tools](https://github.com/dotnet/cli/releases) version 2.0.0 or higher
-> You want the **.NET Core SDK Binaries** for your platform <br>
->
-> `dotnet --version ` <br>
-> ` 2.0.2 ` <br>
+
+* [Node](https://nodejs.org) (7.10.0 or higher)
+* [Node Package Manager](https://www.npmjs.com/package/npm)
+* [.NET CLI tools](https://github.com/dotnet/cli/releases) version 2.0.0 or higher
+  > You want the **.NET Core SDK Binaries** for your platform <br>
+  >
+  > `dotnet --version` <br>
+ > `2.0.2` <br>
 
 ## Build scripts
+
 ### How to build
-The first step would be to run ```npm install``` so we have all the required modules installed.
+
+The first step would be to run `npm install` so we have all the required modules installed.
+
 #### How to build the whole repo
-```
-gulp
+
+```javascript
+gulp;
 ```
 
 ### How to test
+
 To run all tests under the repo
-```
+
+```javascript
 gulp test
 ```
+
 ### How to bundle node package & install
-```
+
+```javascript
 gulp pack
 npm install -g oad-0.1.0.tgz
 ```

openapi-diff/src/modeler/AutoRest.Swagger/Model/Operation.cs

@@ -23,8 +23,8 @@ public Operation()
         public IList<string> Tags { get; set; }
 
         /// <summary>
-        /// A friendly serviceTypeName for the operation. The id MUST be unique among all 
-        /// operations described in the API. Tools and libraries MAY use the 
+        /// A friendly serviceTypeName for the operation. The id MUST be unique among all
+        /// operations described in the API. Tools and libraries MAY use the
         /// operation id to uniquely identify an operation.
         /// </summary>
         public string OperationId { get; set; }
@@ -43,34 +43,34 @@ public Operation()
         public IList<string> Consumes { get; set; }
 
         /// <summary>
-        /// A list of MIME types the operation can produce. 
+        /// A list of MIME types the operation can produce.
         /// </summary>
         public IList<string> Produces { get; set; }
 
         /// <summary>
-        /// A list of parameters that are applicable for this operation. 
-        /// If a parameter is already defined at the Path Item, the 
+        /// A list of parameters that are applicable for this operation.
+        /// If a parameter is already defined at the Path Item, the
         /// new definition will override it, but can never remove it.
         /// </summary>
-        public IList<SwaggerParameter> Parameters { get; set; }
+        public IList<SwaggerParameter> Parameters { get; set; } = new List<SwaggerParameter>();
 
         /// <summary>
         /// The list of possible responses as they are returned from executing this operation.
         /// </summary>
         public Dictionary<string, OperationResponse> Responses { get; set; }
 
         /// <summary>
-        /// The transfer protocol for the operation. 
+        /// The transfer protocol for the operation.
         /// </summary>
         public IList<TransferProtocolScheme> Schemes { get; set; }
 
         public bool Deprecated { get; set; }
 
         /// <summary>
-        /// A declaration of which security schemes are applied for this operation. 
-        /// The list of values describes alternative security schemes that can be used 
-        /// (that is, there is a logical OR between the security requirements). 
-        /// This definition overrides any declared top-level security. To remove a 
+        /// A declaration of which security schemes are applied for this operation.
+        /// The list of values describes alternative security schemes that can be used
+        /// (that is, there is a logical OR between the security requirements).
+        /// This definition overrides any declared top-level security. To remove a
         /// top-level security declaration, an empty array can be used.
         /// </summary>
         public IList<Dictionary<string, List<string>>> Security { get; set; }
@@ -150,8 +150,8 @@ private void CheckParameters(ComparisonContext context, Operation priorOperation
             var currentRoot = (context.CurrentRoot as ServiceDefinition);
             var previousRoot = (context.PreviousRoot as ServiceDefinition);
 
-            var priorOperationParameters = priorOperation.Parameters.Select(param => 
-                                             string.IsNullOrWhiteSpace(param.Reference) ? 
+            var priorOperationParameters = priorOperation.Parameters.Select(param =>
+                                             string.IsNullOrWhiteSpace(param.Reference) ?
                                              param : FindReferencedParameter(param.Reference, previousRoot.Parameters));
             foreach (var oldParam in priorOperationParameters)
             {
@@ -173,8 +173,8 @@ private void CheckParameters(ComparisonContext context, Operation priorOperation
             }
 
             // Check that no required parameters were added.
-            var requiredParamters = Parameters.Select(param => 
-                                        string.IsNullOrWhiteSpace(param.Reference) ? 
+            var requiredParamters = Parameters.Select(param =>
+                                        string.IsNullOrWhiteSpace(param.Reference) ?
                                         param : FindReferencedParameter(param.Reference, currentRoot.Parameters))
                                         .Where(p => p != null && p.IsRequired);
             foreach (var newParam in requiredParamters)