Catch ContentTypeError in 2FA

[mkmer]

Description:

Appears sometimes non JSON is returned in 2FA and not caught.
home-assistant/core#107143
This does not address the root problem - text instead of JSON response.

Related issue (if applicable): fixes #

Checklist:

• Local tests with tox run successfully PR cannot be merged unless tests pass
• Changes tested locally to ensure platform still works as intended
• Tests added to verify new code works

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (864de67) 99.86% compared to head (64af647) 99.86%.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #843   +/-   ##
=======================================
  Coverage   99.86%   99.86%           
=======================================
  Files           8        8           
  Lines        1460     1460           
=======================================
  Hits         1458     1458           
  Misses          2        2           

Flag	Coverage Δ
unittests	99.86% <100.00%> (ø)

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