chore: create a new collection if tags are null

Author: MaggieKimani1

src/Microsoft.OpenApi.OData.Reader/Operation/ComplexPropertyBaseOperationHandler.cs

@@ -9,6 +9,7 @@
 using Microsoft.OpenApi.OData.Common;
 using Microsoft.OpenApi.OData.Edm;
 using Microsoft.OpenApi.OData.Vocabulary.Core;
+using System.Collections.Generic;
 
 namespace Microsoft.OpenApi.OData.Operation;
 
@@ -35,7 +36,7 @@ protected override void Initialize(ODataContext context, ODataPath path)
     protected override void SetTags(OpenApiOperation operation)
     {
         string tagName = EdmModelHelper.GenerateComplexPropertyPathTagName(Path, Context);
-
+        operation.Tags ??= new HashSet<OpenApiTagReference>();
         if (!string.IsNullOrEmpty(tagName))
         {
             Context.AddExtensionToTag(tagName, Constants.xMsTocType, new OpenApiAny("page"), () => new OpenApiTag()

src/Microsoft.OpenApi.OData.Reader/Operation/DollarCountGetOperationHandler.cs

@@ -85,6 +85,8 @@ private void AddODataSegmentToAnnotables(ODataSegment oDataSegment, ODataSegment
         protected override void SetTags(OpenApiOperation operation)
         {
             string tagName = null;
+            operation.Tags ??= new HashSet<OpenApiTagReference>();
+
             if (SecondLastSegment is ODataNavigationSourceSegment sourceSegment)
             {
                 tagName = TagNameFromNavigationSourceSegment(sourceSegment);

src/Microsoft.OpenApi.OData.Reader/Operation/EdmOperationImportOperationHandler.cs

@@ -141,6 +141,8 @@ protected override void SetTags(OpenApiOperation operation)
             var tag = CreateTag(EdmOperationImport);
             tag.Extensions.Add(Constants.xMsTocType, new OpenApiAny("container"));
             Context.AppendTag(tag);
+
+            operation.Tags ??= new HashSet<OpenApiTagReference>();
             operation.Tags.Add(new OpenApiTagReference(tag.Name, _document));
 
             base.SetTags(operation);

src/Microsoft.OpenApi.OData.Reader/Operation/EdmOperationOperationHandler.cs

@@ -154,6 +154,7 @@ protected override void SetTags(OpenApiOperation operation)
                 Name = tagName,
             };
             tag.Extensions.Add(Constants.xMsTocType, new OpenApiAny("container"));
+            operation.Tags ??= new HashSet<OpenApiTagReference>();
             operation.Tags.Add(new OpenApiTagReference(tag.Name, _document));
 
             Context.AppendTag(tag);

src/Microsoft.OpenApi.OData.Reader/Operation/EntitySetOperationHandler.cs

@@ -10,6 +10,7 @@
 using Microsoft.OpenApi.OData.Common;
 using Microsoft.OpenApi.OData.Edm;
 using Microsoft.OpenApi.OData.Vocabulary.Core;
+using System.Collections.Generic;
 
 namespace Microsoft.OpenApi.OData.Operation
 {
@@ -46,7 +47,7 @@ protected override void Initialize(ODataContext context, ODataPath path)
         protected override void SetTags(OpenApiOperation operation)
         {
             var tagName = EntitySet.Name + "." + EntitySet.EntityType.Name;
-
+            operation.Tags ??= new HashSet<OpenApiTagReference>();
             operation.Tags.Add(new OpenApiTagReference(tagName, _document));
 
             Context.AddExtensionToTag(tagName, Constants.xMsTocType, new OpenApiAny("page"), () => new OpenApiTag()

src/Microsoft.OpenApi.OData.Reader/Operation/MediaEntityOperationalHandler.cs

@@ -96,6 +96,8 @@ protected override void SetTags(OpenApiOperation operation)
 			{
 				Name = tagIdentifier
 			});
+
+            operation.Tags ??= new HashSet<OpenApiTagReference>();
             operation.Tags.Add(new OpenApiTagReference(tagIdentifier, _document));
         }
 

src/Microsoft.OpenApi.OData.Reader/Operation/NavigationPropertyOperationHandler.cs

@@ -99,6 +99,7 @@ protected override void SetTags(OpenApiOperation operation)
 			{
 				Name = name
 			});
+            operation.Tags ??= new HashSet<OpenApiTagReference>();
             operation.Tags.Add(new OpenApiTagReference(name, _document));
 
             base.SetTags(operation);

src/Microsoft.OpenApi.OData.Reader/Operation/ODataTypeCastGetOperationHandler.cs

@@ -238,6 +238,7 @@ protected override void SetResponses(OpenApiOperation operation)
 	protected override void SetTags(OpenApiOperation operation)
 	{
         string tagName = null;
+        operation.Tags ??= new HashSet<OpenApiTagReference>();
 
         if (SecondLastSegment is ODataNavigationPropertySegment || isIndexedCollValuedNavProp)
 		{

src/Microsoft.OpenApi.OData.Reader/Operation/SingletonOperationHandler.cs

@@ -10,6 +10,7 @@
 using Microsoft.OpenApi.OData.Common;
 using Microsoft.OpenApi.OData.Edm;
 using Microsoft.OpenApi.OData.Vocabulary.Core;
+using System.Collections.Generic;
 
 namespace Microsoft.OpenApi.OData.Operation
 {
@@ -53,7 +54,7 @@ protected override void SetTags(OpenApiOperation operation)
 			{
 				Name = tagName
 			});
-
+            operation.Tags ??= new HashSet<OpenApiTagReference>();
             operation.Tags.Add(new OpenApiTagReference(tagName, _document));
 
             // Call base.SetTags() at the end of this method.

test/Microsoft.OpenAPI.OData.Reader.Tests/Microsoft.OpenAPI.OData.Reader.Tests.csproj

@@ -88,7 +88,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
-    <PackageReference Include="Microsoft.OpenApi" Version="2.0.0-preview.13" />
+    <PackageReference Include="Microsoft.OpenApi" Version="2.0.0-preview.14" />
     <PackageReference Include="moq" Version="4.20.72" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
     <PackageReference Include="xunit" Version="2.9.3" />