Ensure debug tools show for 'complete msg object'

editor/js/ui/utils.js

@@ -476,7 +476,7 @@ RED.utils = (function() {
                     for (i=0;i<keys.length;i++) {
                         var row = $('<div class="debug-message-object-entry collapsed"></div>').appendTo(element);
                         var newPath = path;
-                        if (newPath) {
+                        if (newPath !== undefined) {
                             if (/^[a-zA-Z_$][0-9a-zA-Z_$]*$/.test(keys[i])) {
                                 newPath += (newPath.length > 0?".":"")+keys[i];
                             } else {