Custom task uninstalling shows an error message in case its WID is open

Create a project. Go to project Settings and install any Custom task. Save the changes. Navigate to Assets and open Custom task's WID file. Do not close the file and navigate back to project Settings. Click uninstall next to the previously installed Custom task. Actual result An error dialogue is shown with the message: " User has deleted the following resource default://master@MySpace/project/global/CustomTask.wid. " Expected result No error dialogue is shown.