Use file.exists instead of try-catch

[bpbond]

See #692

[github-actions[bot]]

Differences in Hector outputs

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The current pull request's outputs do not differ from 3.0.0 (9aebf67).

[codecov-commenter]

Codecov Report

Merging #693 (16fa235) into v3_dev (1ccacc9) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           v3_dev     #693   +/-   ##
=======================================
  Coverage   79.69%   79.69%           
=======================================
  Files          61       61           
  Lines        5935     5935           
=======================================
  Hits         4730     4730           
  Misses       1205     1205           

Impacted Files	Coverage Δ
src/ini_to_core_reader.cpp	95.23% <100.00%> (ø)

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