The RBAC_checks management command gives false positives about models without view permission

### Bug Summary

In AWX, which is coherently configured as far as I can tell

```
$ awx-manage RBAC_checks
Inspecting 31 role definitions
  checking for minimum of view permission
Role definition ExecutionEnvironment Admin does not list any view permissions and this is considered invalid
```

It's totally fine. It shouldn't give this message.