Unable to invoke smalltalkCI with option `--clean` if `.smalltalk.ston` is absent

[LinqLover]

• Steps to reproduce: cd smalltalkCI/bin && ./smalltalkci --clean
• Expected behavior: Clean up works as usual
• Actual behavior: No STON file named '.smalltalk.ston'

The problem appears to be that in the run.sh, ensure_ston_config_exists is called before check_clean_up:

https://github.com/hpi-swa/smalltalkCI/blob/cac96a5fd62f38b04dfacf774baec2fa946f0f97/run.sh#L525-L529

Intuitively, I would have swapped the two last statements, but to support continuation after the --clean option, check_clean_up depends on config_ston which is initialized in ensure_ston_config_exists only:

https://github.com/hpi-swa/smalltalkCI/blob/cac96a5fd62f38b04dfacf774baec2fa946f0f97/run.sh#L442-L446

Would it be okay to check for config_first_arg_or_empty instead to eliminate this dependency?

[fniephaus]

Would it be okay to check for config_first_arg_or_empty instead to eliminate this dependency?

Sure, please draft a PR and I'll take a look.

[LinqLover]

Done in #520, ready for review! :-)