[FTBFS] charmcraft internal error: ValidationError(model='CheckResult', errors=[{'loc': ('text',), 'msg': 'none is not an allowed value', 'type': 'type_error.none.not_allowed'}])

[Felipe Reyes]

ceph-fs charm is failing to build in Launchpad (and locally). This is preventing from publishing newer builds for Reef.

```
Execute action
:: + echo 'Copying charm to staging area: /home/buildd/ceph-fs/build/stage'
:: Copying charm to staging area: /home/buildd/ceph-fs/build/stage
:: ++ ls /home/buildd/ceph-fs/build/parts/charm/build/build/builds
:: + NAME=ceph-fs
:: + cp -r /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/LICENSE /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/Makefile /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/README.md /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/actions /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/actions.yaml /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/bin /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/config.yaml /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/copyright /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/copyright.layer-basic /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/copyright.layer-options /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/exec.d /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/files /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/hooks /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/icon.svg /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/layer.yaml /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/lib /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/metadata.yaml /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/reactive /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/requirements.txt /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/templates /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/test-requirements.txt /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/tests /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/tox.ini /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/version /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/wheelhouse /home/buildd/ceph-fs/build/parts/charm/build/build/builds/ceph-fs/wheelhouse.txt /home/buildd/ceph-fs/build/stage/
Running step PRIME for part 'charm'
Execute action
:: + cp -r /home/buildd/ceph-fs/build/stage/LICENSE /home/buildd/ceph-fs/build/stage/Makefile /home/buildd/ceph-fs/build/stage/README.md /home/buildd/ceph-fs/build/stage/actions /home/buildd/ceph-fs/build/stage/actions.yaml /home/buildd/ceph-fs/build/stage/bin /home/buildd/ceph-fs/build/stage/config.yaml /home/buildd/ceph-fs/build/stage/copyright /home/buildd/ceph-fs/build/stage/copyright.layer-basic /home/buildd/ceph-fs/build/stage/copyright.layer-options /home/buildd/ceph-fs/build/stage/exec.d /home/buildd/ceph-fs/build/stage/files /home/buildd/ceph-fs/build/stage/hooks /home/buildd/ceph-fs/build/stage/icon.svg /home/buildd/ceph-fs/build/stage/layer.yaml /home/buildd/ceph-fs/build/stage/lib /home/buildd/ceph-fs/build/stage/metadata.yaml /home/buildd/ceph-fs/build/stage/reactive /home/buildd/ceph-fs/build/stage/requirements.txt /home/buildd/ceph-fs/build/stage/templates /home/buildd/ceph-fs/build/stage/test-requirements.txt /home/buildd/ceph-fs/build/stage/tests /home/buildd/ceph-fs/build/stage/tox.ini /home/buildd/ceph-fs/build/stage/version /home/buildd/ceph-fs/build/stage/wheelhouse /home/buildd/ceph-fs/build/stage/wheelhouse.txt .
charmcraft internal error: ValidationError(model='CheckResult', errors=[{'loc': ('text',), 'msg': 'none is not an allowed value', 'type': 'type_error.none.not_allowed'}])
Full execution log: '/root/.local/state/charmcraft/log/charmcraft-20240103-142834.595471.log'
Build failed
```

Ref: https://launchpad.net/~openstack-charmers/charm-ceph-fs/+charm/charm-ceph-fs.master.reef-latest/+build/17930

[Alex Kavanagh (ajkavanagh)]

I think this is a known bug in charmcraft: https://github.com/canonical/charmcraft/issues/1439 ?