Resolve visitor change: If the type of an object create expression

can't be resolved give back the type resolution failure.
This is required to tell why the object creation couldn't be resolved.

ICSharpCode.NRefactory.CSharp/Resolver/ResolveVisitor.cs

@@ -1310,7 +1310,10 @@ namespace ICSharpCode.NRefactory.CSharp.Resolver
 		ResolveResult IAstVisitor<ResolveResult>.VisitObjectCreateExpression(ObjectCreateExpression objectCreateExpression)
 		{
 			if (resolverEnabled || !objectCreateExpression.Initializer.IsNull) {
-				IType type = ResolveType(objectCreateExpression.Type);
+				var typeResolveResult = Resolve(objectCreateExpression.Type);
+				if (typeResolveResult.IsError)
+					return typeResolveResult;
+				IType type = typeResolveResult.Type;
 				
 				var initializer = objectCreateExpression.Initializer;
 				if (!initializer.IsNull) {

ICSharpCode.NRefactory.Tests/CSharp/Resolver/ObjectCreationTests.cs

@@ -43,7 +43,7 @@ class A {
 		}
 		
 		[Test]
-		public void NonExistingClass()
+		public void NonExistingClass ()
 		{
 			string program = @"class A {
 	void Method() {
@@ -51,7 +51,8 @@ class A {
 	}
 }
 ";
-			ResolveResult result = Resolve<ErrorResolveResult>(program);
+			ResolveResult result = Resolve (program);
+			Assert.IsTrue (result.IsError);
 			Assert.AreSame(SpecialType.UnknownType, result.Type);
 		}