Fix the selected value if no config nodes available

Co-authored-by: Nick O'Leary <nick.oleary@gmail.com>

packages/node_modules/@node-red/editor-client/src/js/ui/editor.js

@@ -426,8 +426,13 @@ RED.editor = (function() {
             }
         });
 
-        // Set the select value
-        select.val(nodeValue);
+        const optionCount = select.find("option").length
+        if (optionCount === 1) {
+            // We only have the 'add new...' option
+            select.val('_ADD_')
+        } else {
+            select.val(nodeValue);
+        }
     }
 
     /**