deploy: print error message if values file not found

[christiansiegel]

No description provided.

[joachimprinzbach]

Not sure wether to use sys.exit or raise an exception with the message?

[christiansiegel]

Raising an exception is a bit ugly, don't you think?

[joachimprinzbach]

imo sys.exit is ugly - but i wrote my first line of pythin on wednesday, so up to you to choose the better solution. As long as the caller gets an appropriate message and exit code im fine with either solution

[joachimprinzbach]

Just for consistency: https://github.com/baloise-incubator/gitopscli/blob/master/gitopscli/commands/sync_apps.py#L137
Then this should be changes as well

[joachimprinzbach]

One option: throw exceptions with messages and catch them globally. Handle them there, log the message and exit

[christiansiegel]

sys.exit is not the worst, e.g. try-finally still works. But handling the exceptions globally is even better, true.