Handle unknown key in configure

[drc38]

May fix #432

[codecov]

Codecov Report

Merging #438 (39f81ff) into main (9420ec4) will decrease coverage by 0.04%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main     #438      +/-   ##
==========================================
- Coverage   89.79%   89.74%   -0.05%     
==========================================
  Files          10       10              
  Lines        1215     1219       +4     
  Branches      183      185       +2     
==========================================
+ Hits         1091     1094       +3     
  Misses         61       61              
- Partials       63       64       +1     

Impacted Files	Coverage Δ
custom_components/ocpp/api.py	85.08% <75.00%> (-0.06%)	⬇️

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[lbbrhzn]

lgtm