non-existent or empty collections cause exception with exist error status 1

[janiheikkinen]

Non-existent or empty collections to be accounted causes exception with exist error status 1.

Exception invalid literal for int() with base 10: '' encountered!

$ iRODScollector --version
1.0.1

[raphael-ritz]

Thanks for pointing this out Jani. What would you expect to happen in such a case? Silently ignoring it? Maybe plus logging a warning?
Any preference?