ResourceToolkit: Fixed NullReferenceException when a ResourceManager access is resolved and the source code contains an assignment to a variable which does not have a return type.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/2.1@2504 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/Misc/ResourceToolkit/Project/Src/Resolver/BclNRefactoryResourceResolver.cs

@@ -637,9 +637,14 @@ namespace Hornung.ResourceToolkit.Resolver
 		/// </summary>
 		public static bool IsTypeRelationshipPossible(IMember member1, IMember member2)
 		{
+			if (member1.ReturnType == null || member2.ReturnType == null) {
+				return false;
+			}
+			
 			if (member1.ReturnType.Equals(member2.ReturnType)) {
 				return true;
 			}
+			
 			IClass class1;
 			IClass class2;
 			if ((class1 = member1.ReturnType.GetUnderlyingClass()) == null) {