Merge pull request #43 from turbanoff/patch-1

remove redundant check

ICSharpCode.NRefactory.CSharp/Ast/AstNode.cs

@@ -483,7 +483,7 @@ namespace ICSharpCode.NRefactory.CSharp
 			newNode.SetRole(this.Role);
 			newNode.prevSibling = prevSibling;
 			newNode.nextSibling = nextSibling;
-			if (parent != null) {
+
 			if (prevSibling != null) {
 				Debug.Assert (prevSibling.nextSibling == this);
 				prevSibling.nextSibling = newNode;
@@ -502,7 +502,6 @@ namespace ICSharpCode.NRefactory.CSharp
 			prevSibling = null;
 			nextSibling = null;
 		}
-		}
 		
 		public AstNode ReplaceWith (Func<AstNode, AstNode> replaceFunction)
 		{