simplify exception handling on integer overflow

[RouquinBlanc]

Changes proposed in this pull request:

• Quick improvement of Fix exceptions on encoding list or dict elements and non-overflow errors on int handling getting silenced #505

[codecov-commenter]

Codecov Report

Merging #510 (9fe39f1) into main (fbae6a3) will increase coverage by 0.10%.
The diff coverage is n/a.

❗ Current head 9fe39f1 differs from pull request most recent head 1d064f4. Consider uploading reports for the commit 1d064f4 to get more accurate results

@@            Coverage Diff             @@
##             main     #510      +/-   ##
==========================================
+ Coverage   88.88%   88.98%   +0.10%     
==========================================
  Files           6        6              
  Lines        1709     1707       -2     
==========================================
  Hits         1519     1519              
+ Misses        190      188       -2     

Impacted Files	Coverage Δ
python/objToJSON.c	85.00% <ø> (+0.40%)	⬆️

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[bwoodsend]

Thanks @RouquinBlanc!