fixing invalid authorization header

* Do not send Authorization when None
* Send a User Agent string with the request
small fixing - syntax, modules

a nice typo on the label needsdiagnosis ;)
Check response for filter_untriaged - FIX #247

Necessary to avoid filter_untriaged to vomit.
fixed a stray comment
Merge branch 'karlcow-credentials'

* karlcow-credentials:
  fixed a stray comment
  Check response for filter_untriaged - FIX #247
  small fixing - syntax, modules
  fixing invalid authorization header
Janitor for straightening code style using flake8