Print output from errors coming from subprocesses in `tiled serve config`?

[pbeaucage]

While trying to serve an existing catalog from filesystem, I've noticed a few times that if an underlying call inside tiled serve config ... fails (for instance: tiled catalog init --if-not-exist), the details of that error don't bubble out to the console. Instead, you get a generic error from subprocess:

subprocess.CalledProcessError: Command 
'['/path/to/env/bin/python3.9', '-m', 'tiled', 'catalog', 'init', '--if-not-exists', 'catalog.db']' returned non-zero exit status 1.

A savvy user will know to run that command alone and find out that the SQLite catalog version doesn't match the local tiled version, but it save a debugging step (and potentially a confusing one for a novice user) if the stderr output from the subprocess call was printed to the console. Are there any downsides to doing this or issues it would cause?