Exception shoudn't be raised when no message catalogs

[fenekku]

Package version (if known): v1.5.0

Describe the bug

When running invenio-cli services setup, for an instance that doesn't use translations, the following exception is thrown and shows up on the terminal:

# ...
Created required fixtures! 
Compiling message catalog...                                                                                                                                                 
Loading .env environment variables...                                                                                                                                        
Traceback (most recent call last):                                                                                                                                           
  File "/home/me/my-project/.venv/bin/pybabel", line 8, in <module>                                                                                       
    sys.exit(main())                                                                                                                                                         
  File "/home/me/my-project/.venv/lib/python3.9/site-packages/babel/messages/frontend.py", line 999, in main                                              
    return CommandLineInterface().run(sys.argv)                                                                                                                              
  File "/home/me/my-project/.venv/lib/python3.9/site-packages/babel/messages/frontend.py", line 925, in run                                               
    return cmdinst.run()                                                                                                                                                     
  File "/home/me/my-project/.venv/lib/python3.9/site-packages/babel/messages/frontend.py", line 199, in run                                               
    for errors in self._run_domain(domain).values():                                                                                                                         
  File "/home/me/my-project/.venv/lib/python3.9/site-packages/babel/messages/frontend.py", line 237, in _run_domain                                       
    raise OptionError('no message catalogs found')                                                                                                                           
babel.messages.frontend.OptionError: no message catalogs found  

Declaring queues...
# ...

This doesn't prevent the rest of the steps to go ahead, but is alarming to the lay-developer. Absence of translations should not be a concern.

Expected behavior

Multiple avenues are possible. Either:

• like custom fields, print out No message catalogs found. Exiting... in green
• like custom fields but in orange and using "skipping": "No message catalogs found. Skipping."
• not even attempting to compile message catalogs in the first place
• not printing anything following "Compiling message catalog..."