[Bug]: Services without model mapping are displayed in Models UI

[jvstme]

Steps to reproduce

Run a service without a model mapping and wait until it is running.

> cat .dstack.yml
type: service
name: my-service

commands:
  - python -m http.server
port: 8000

> dstack apply -y

Actual behaviour

The service is displayed on the Models page with fictive properties.

Expected behaviour

The service is not displayed on the Models page. Only runs with a model mapping (non-empty service.model property) should be displayed there.

dstack version

0.18.24

Server logs

No response

Additional information

No response