replaced try/except with get

[peppelinux]

No description provided.

[codecov]

Codecov Report

Merging #27 into master will increase coverage by 0.08%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   77.55%   77.63%   +0.08%     
==========================================
  Files          37       37              
  Lines        3693     3675      -18     
  Branches      715      716       +1     
==========================================
- Hits         2864     2853      -11     
+ Misses        603      595       -8     
- Partials      226      227       +1

Impacted Files	Coverage Δ
src/cryptojwt/key_jar.py	77.8% <83.33%> (+0.71%)	⬆️

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