PHP warning on image props without examples

Note: as can be seen in the component that has been linked in the issue summary, the property triggering the error is not required. In this case, the component props are valid as optional properties are allowed to not provide an example.

While this issue was submitted earlier than 🐛 PHP warnings thrown for optional image or date-time SDC props without examples Active , I didn't manage to find it. The MR in that issue is passing CI, so keeping that one.