Fixed NullRerferenceExcpetion in SimpleMemberReference evaluator. If member not found, throw exception.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@2923 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/Misc/Debugger/Debugger.AddIn/Project/Src/Expressions/SimpleIdentifierExpression.cs

@@ -46,7 +46,7 @@ namespace Debugger.Expressions
 				if (member != null) return member;
 			}
 			
-			throw new GetValueException("Identifier " + identifier + " not found");
+			throw new GetValueException("Identifier \"" + identifier + "\" not found");
 		}
 		
 		#region GetHashCode and Equals

src/AddIns/Misc/Debugger/Debugger.AddIn/Project/Src/Expressions/SimpleMemberReferenceExpression.cs

@@ -38,7 +38,12 @@ namespace Debugger.Expressions
 		protected override Value EvaluateInternal(StackFrame context)
 		{
 			Value targetValue = targetObject.Evaluate(context);
-			return targetValue.GetMemberValue(member);
+			Value memberValue = targetValue.GetMemberValue(member);
+			if (memberValue != null) {
+				return memberValue;
+			} else {
+				throw new GetValueException("Member \"" + member + "\" not found");
+			}
 		}
 		
 		#region GetHashCode and Equals