More robust column selection on esp_get_prov_siane()

[dieghernan]

Would fix #115

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.31%. Comparing base (1cce4db) to head (7dc25da).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #116   +/-   ##
=======================================
  Coverage   96.31%   96.31%           
=======================================
  Files          31       31           
  Lines        1871     1874    +3     
=======================================
+ Hits         1802     1805    +3     
  Misses         69       69           

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