fix: invalid event type error (#918)

Author: praneetap

samtranslator/model/sam_resources.py

@@ -268,7 +268,7 @@ def _event_resources_to_link(self, resources):
                 try:
                     event_source = self.event_resolver.resolve_resource_type(event_dict).from_dict(
                         self.logical_id + logical_id, event_dict, logical_id)
-                except TypeError as e:
+                except (TypeError, AttributeError) as e:
                     raise InvalidEventException(logical_id, "{}".format(e))
                 event_resources[logical_id] = event_source.resources_to_link(resources)
         return event_resources

tests/translator/input/error_function_invalid_event_type.yaml

@@ -24,3 +24,13 @@ Resources:
             Method: get
             Path: /
 
+  TestFunction:
+    Type: AWS::Serverless::Function
+    Properties:
+      CodeUri: code/
+      Handler: lambda_handler.handler
+
+      Runtime: python3.6
+      Events:
+        FileUploaded:
+

tests/translator/output/error_function_invalid_event_type.json

@@ -4,5 +4,5 @@
       "errorMessage": "Resource with id [FunctionApiTypeError] is invalid. Event with id [ApiEvent] is invalid. Resource dict has missing or invalid value for key Type. Event Type is: API. Resource with id [FunctionNoEventType] is invalid. Event with id [MissingType] is invalid. Resource dict has missing or invalid value for key Type. Event Type is: None."
     }
   ], 
-  "errorMessage": "Invalid Serverless Application Specification document. Number of errors found: 2. Resource with id [FunctionApiTypeError] is invalid. Event with id [ApiEvent] is invalid. Resource dict has missing or invalid value for key Type. Event Type is: API. Resource with id [FunctionNoEventType] is invalid. Event with id [MissingType] is invalid. Resource dict has missing or invalid value for key Type. Event Type is: None."
+  "errorMessage": "Invalid Serverless Application Specification document. Number of errors found: 3. Resource with id [FunctionApiTypeError] is invalid. Event with id [ApiEvent] is invalid. Resource dict has missing or invalid value for key Type. Event Type is: API. Resource with id [FunctionNoEventType] is invalid. Event with id [MissingType] is invalid. Resource dict has missing or invalid value for key Type. Event Type is: None. Resource with id [TestFunction] is invalid. Event with id [FileUploaded] is invalid. 'NoneType' object has no attribute 'get'"
 }