Fix WriteVersionInfoTest failure (pad parameter validation/passing)

Author: MarkusHorstmann

src/GitVersion.Core/Helpers/OperationWithExponentialBackoff.cs

@@ -31,7 +31,7 @@ public OperationWithExponentialBackoff(IThreadSleep threadSleep, ILog log, Func<
                 throw new ArgumentOutOfRangeException(nameof(maxRetries));
 
             this.threadSleep = threadSleep ?? throw new ArgumentNullException(nameof(threadSleep));
-            this.log = log;
+            this.log = log ?? throw new ArgumentNullException(nameof(log));
             this.operation = operation;
             this.maxRetries = maxRetries;
         }

src/GitVersion.Core/Model/VersionVariables.cs

@@ -168,11 +168,9 @@ public static VersionVariables FromJson(string json)
 
         public static VersionVariables FromFile(string filePath, IFileSystem fileSystem, ILog log)
         {
-            var retryOperation = new OperationWithExponentialBackoff<IOException, VersionVariables>(new ThreadSleep(), null, () => FromFileInternal(filePath, fileSystem));
-
+            var retryOperation = new OperationWithExponentialBackoff<IOException, VersionVariables>(new ThreadSleep(), log, () => FromFileInternal(filePath, fileSystem));
             var versionVariables = retryOperation.ExecuteAsync().Result;
             return versionVariables;
-
         }
         private static VersionVariables FromFileInternal(string filePath, IFileSystem fileSystem)
         {