Fixed NullReferenceException in TypeResolveResult.IsReferenceTo.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@5767 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Main/ICSharpCode.SharpDevelop.Dom/Project/Src/ResolveResult.cs

@@ -480,7 +480,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 		public override bool IsReferenceTo(IEntity entity)
 		{
 			IClass c = entity as IClass;
-			return c != null
+			return c != null && resolvedClass != null
 				&& resolvedClass.FullyQualifiedName == c.FullyQualifiedName
 				&& resolvedClass.TypeParameters.Count == c.TypeParameters.Count;
 		}