Suppress csv.Sniffer exception

[yunzheng]

Sometimes the CSV Sniffer cannot determine the delimiter and would raise: "Could not determine delimiter"

This PR suppresses this exception so it can still continue parsing the CSV with default settings.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.25%. Comparing base (d842ba4) to head (7eea98f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #174   +/-   ##
=======================================
  Coverage   82.24%   82.25%           
=======================================
  Files          34       34           
  Lines        3650     3652    +2     
=======================================
+ Hits         3002     3004    +2     
  Misses        648      648           

Flag	Coverage Δ
unittests	82.25% <100.00%> (+<0.01%)	⬆️

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