Added RepositoryNameMaps as class attribute (#2524)

Fix for : #2498

src/MigrationTools.Clients.AzureDevops.Rest/Processors/AzureDevOpsPipelineProcessorOptions.cs

@@ -17,6 +17,7 @@ public AzureDevOpsPipelineProcessorOptions()
             MigrateServiceConnections = true;
             BuildPipelines = null;
             ReleasePipelines = null;
+            RepositoryNameMaps = new Dictionary < string, string > ();
             SourceName = "sourceName";
             TargetName = "targetName";
         }
@@ -66,4 +67,4 @@ public AzureDevOpsPipelineProcessorOptions()
         public Dictionary<string, string> RepositoryNameMaps { get; set; } //Can we reuse GitRepoMapping?
 
     }
-}
+}