use key with schema.title for circular schemas where title do not have meaning

gadget_json_generated_form.js

@@ -729,7 +729,9 @@
       gadget.props.property_name_edit = label;
     } else {
       label = document.createElement("label");
-      label.textContent = json_field.title || key;
+      label.textContent = [key, json_field.title]
+        .filter(function (v) { return v; })
+        .join(" ");
     }
     div.appendChild(label);
     div_input = document.createElement("div");