fix: handle TypeErrors too

[pjenvey]

Closes #1326

[codecov-io]

Codecov Report

Merging #1332 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1332      +/-   ##
==========================================
+ Coverage   99.79%   99.79%   +<.01%     
==========================================
  Files          64       64              
  Lines       10393    10394       +1     
==========================================
+ Hits        10372    10373       +1     
  Misses         21       21

Impacted Files	Coverage Δ
autopush/tests/test_integration.py	100% <100%> (ø)	⬆️
autopush/web/webpush.py	100% <100%> (ø)	⬆️

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