capture missing json file error

[neutrinoceros]

fix #56

[codecov]

Codecov Report

Merging #58 (803dd3d) into main (eedd3f6) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #58   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          209       221   +12     
=========================================
+ Hits           209       221   +12     

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

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Impacted Files	Coverage Δ
apply_subs/__init__.py	100.00% <100.00%> (ø)
apply_subs/main.py	100.00% <100.00%> (ø)
tests/test_errors.py	100.00% <100.00%> (ø)

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