Strip namespace prefix independently of aliasing

Author: irvinesunday

src/Microsoft.OpenApi.OData.Reader/Common/EdmModelHelper.cs

@@ -378,7 +378,9 @@ internal static string StripOrAliasNamespacePrefix(IEdmSchemaElement element, Op
                     // Alias operation segment name 
                     segmentName = namespaceAlias.TrimEnd('.') + "." + element.Name;
                 }
-                else if (element.Namespace.Equals(settings.NamespacePrefixToStripForInMethodPaths, StringComparison.OrdinalIgnoreCase))
+                
+                if (settings.NamespacePrefixToStripForInMethodPaths != null && 
+                    element.Namespace.Equals(settings.NamespacePrefixToStripForInMethodPaths, StringComparison.OrdinalIgnoreCase))
                 {
                     // Strip specified namespace from operation segment name                  
                     segmentName = element.Name;

test/Microsoft.OpenAPI.OData.Reader.Tests/Edm/ODataOperationSegmentTests.cs

@@ -102,8 +102,9 @@ public void GetPathItemNameReturnsCorrectFunctionLiteral(bool unqualifiedCall, b
         [InlineData("NS.XY.MyFunction(param={param},param2=@param2)", "NS", "NS.XY", false)]
         [InlineData("MyFunction(param={param},param2=@param2)", "NS.XY", "NS.XY", false)]
         [InlineData("N.MyFunction(param={param},param2=@param2)", "NS", "NS.XY", true)]                
-        [InlineData("N.MyFunction(param={param},param2=@param2)", "NS.XY", "NS.XY", true)]
-        public void GetPathItemNameReturnsCorrectFunctionLiteralWhenSegmentAliasedOrNamespacePrefixStripped(string expected, string namespacePrefixToStrip, string namespaceName, bool enableAlias)
+        [InlineData("MyFunction(param={param},param2=@param2)", "NS.XY", "NS.XY", true)]
+        public void GetPathItemNameReturnsCorrectFunctionLiteralWhenSegmentAliasedOrNamespacePrefixStripped(
+            string expected, string namespacePrefixToStrip, string namespaceName, bool enableAlias)
         {
             // Arrange & Act
             IEdmEntityTypeReference entityTypeReference = new EdmEntityTypeReference(new EdmEntityType(namespaceName, "Entity"), false);