Fixed NullReferenceException for code completion on pointer variables.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/3.0@3590 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Main/Base/Project/Src/TextEditor/Gui/Editor/TextEditorDisplayBinding.cs

@@ -508,5 +508,10 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor.Gui.Editor
 		Control IToolsHost.ToolsControl {
 			get { return TextEditorSideBar.Instance; }
 		}
+		
+		public override string ToString()
+		{
+			return "[" + GetType().Name + " " + this.PrimaryFileName + "]";
+		}
 	}
 }

src/Main/ICSharpCode.SharpDevelop.Dom/Project/Src/Implementations/PointerReturnType.cs

@@ -41,6 +41,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 		{
 			if (rt == null) return false;
 			PointerReturnType prt = rt.CastToDecoratingReturnType<PointerReturnType>();
+			if (prt == null) return false;
 			return baseType.Equals(prt.baseType);
 		}
 		
@@ -71,12 +72,12 @@ namespace ICSharpCode.SharpDevelop.Dom
 		
 		public override List<IMethod> GetMethods()
 		{
-			return base.GetMethods();
+			return new List<IMethod>();
 		}
 		
 		public override List<IProperty> GetProperties()
 		{
-			return base.GetProperties();
+			return new List<IProperty>();
 		}
 		
 		public override IClass GetUnderlyingClass()