Improve error messaging for ASR pipeline.
Author: Narsil
Pull request: yes

# What does this PR do?

- ~~Raise error early (in `_sanitize`) so users don't waste time trying to
  run queries with invalid params.~~ This is not easy unfortunately because the order of resolution of objection is tricky.

- Fix the error was after using `config.inputs_to_logits_ratio` so our
  check was masked by the failing property does not exist.

- Added some manual check on s2t for the error message.
  No non ctc model seems to be used by the default runner (they are all
  skipped).



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Fixes # (issue)


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Comments:
_The documentation is not available anymore as the PR was closed or merged._