Exception error message if misconfigured password authsource

[happydude]

Exception error message if misconfigured password authsource, instead of:

TypeError: get_class(): Argument #1 ($object) must be of type object, null given

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 10.45%. Comparing base (04738b7) to head (10b93be).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #79      +/-   ##
============================================
- Coverage     10.48%   10.45%   -0.03%     
- Complexity      324      325       +1     
============================================
  Files            17       17              
  Lines          1259     1262       +3     
============================================
  Hits            132      132              
- Misses         1127     1130       +3     

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