Merge pull request #19579 from fsacer/master

Add missing null check to WorkspaceMetadataFileReferenceResolver.Equals

src/Workspaces/Core/Portable/Workspace/Host/Metadata/WorkspaceMetadataFileReferenceResolver.cs

@@ -34,7 +34,7 @@ public override ImmutableArray<PortableExecutableReference> ResolveReference(str
 
         public bool Equals(WorkspaceMetadataFileReferenceResolver other)
         {
-            return _metadataService == other._metadataService &&
+            return other != null && _metadataService == other._metadataService &&
                    PathResolver.Equals(other.PathResolver);
         }