Fix tests for project notifications.

gns3server/controller/notification.py

@@ -110,9 +110,9 @@ class Notification:
                 self.project_emit("node.updated", node.__json__())
             except (aiohttp.web.HTTPNotFound, aiohttp.web.HTTPForbidden):  # Project closing
                 return
-        # elif action == "ping":
-        #     event["compute_id"] = compute_id
-        #     self.project_emit(action, event)
+        elif action == "ping":
+             event["compute_id"] = compute_id
+             self.project_emit(action, event)
         else:
             self.project_emit(action, event, project_id)