Undo subflow rename not reflected in palette

public/red/history.js

@@ -193,6 +193,7 @@ RED.history = (function() {
                 }
                 RED.view.dirty(ev.dirty);
                 RED.view.redraw();
+                RED.palette.refresh();
             }
         }
     }

public/red/ui/editor.js

@@ -28,6 +28,7 @@ RED.editor = (function() {
      * @returns {boolean} whether the node is valid. Sets node.dirty if needed
      */
     function validateNode(node) {
+        if (node._def) {
             var oldValue = node.valid;
             node.valid = validateNodeProperties(node, node._def.defaults, node);
             if (node._def._creds) {
@@ -37,6 +38,7 @@ RED.editor = (function() {
                 node.dirty = true;
             }
         }
+    }
     
     /**
      * Validate a node's properties for the given set of property definitions