Deleting an application makes an api call to instances api

### Current Behavior

After deleting an application an api call is made to `api/v1/applications//instances` endpoint with the recently deleted app ip which returns a 404 and throws an error

### Expected Behavior

the instances api call should not be made

### Steps To Reproduce

Create an empty application and delete it.

### Environment

- FlowFuse version: 2.5.0
- Node.js version: N/A
- npm version: N/A
- Platform/OS: N/A
- Browser: N/A

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate