Improved error handling for JSON files

[JarrettR]

Way less annoying for hunting down mangled JSON files

[coveralls]

Coverage decreased (-0.02%) to 32.579% when pulling 6779119 on JarrettR:develop into dd30d47 on threebytesfull:develop.

[codecov-io]

Codecov Report

Merging #1 into develop will decrease coverage by 0.02%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           develop       #1      +/-   ##
===========================================
- Coverage    33.41%   33.38%   -0.03%     
===========================================
  Files           23       23              
  Lines         3591     3594       +3     
  Branches       543      543              
===========================================
  Hits          1200     1200              
- Misses        2383     2386       +3     
  Partials         8        8

Impacted Files	Coverage Δ
pcbmode/utils/component.py	16.5% <0%> (-0.5%)	⬇️

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[threebytesfull]

That looks like a good idea, yes! I'll try to add a test for that this evening and merge it in. Thanks!