Accessing results.by_state creates empty list and corrupts results.most_significant_state

[joni1993]

If you access your results with by_state it creates and empty list entry for the accessed value.

Example:
I use len(results.by_state[np.Critical]) > 0: in Summary.problem to print Critical first followed by Warnings. This though creates an empty record for Critical in my tests (where no critical results exist only warning)- making them fail:

pprint((check.results.most_significant_state))
pprint((check.results.most_significant))

Result:

Critical(code=2, text='critical')
[]

This results in the whole check return CRITICAL, despite having no results that are actually critical (only warnings are present). The issue is most likely due to self.by_state = collections.defaultdict(list)

Workaround:
Don't use results.by_state if you are not sure it contains elements, use results.most_significant_state == np.Critical instead. Still this seems rather critical problem to me.

[mpounsett]

I'll check that out on my next pass of fixes and updates. Thanks for the report.