Fix check copies
# What does this PR do?

The target `make quality` fails when generating the new model table when at least one of the optional packages TF, PT or Flax is not installed. We should not force to have everything installed to do a simple quality check, this can be added to an extra target such as `make full-quality` or something like this.

The fix does a condition checking and replace the raised error by a simple warning.
Replacing the error by a warning defeats the purpose of the check as it will make the CI pass when it should fail. We can see if we want to move it in another command, I'm just afraid it will make the failures in the CI (and what the corresponding fixes are) less understandable to the user.<|||||>Let me think about this over the weekend, I'll try to find a solution by Monday :-)<|||||>Awesome! I let you handle this, so I'm closing the PR.