fix(proto): handle index less zero in low cardinality

[ernado]

No description provided.

[codecov-commenter]

Codecov Report

Merging #124 (280aef9) into main (fe50213) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main     #124   +/-   ##
=======================================
  Coverage   76.83%   76.83%           
=======================================
  Files         120      120           
  Lines        5676     5676           
=======================================
  Hits         4361     4361           
  Misses       1110     1110           
  Partials      205      205           

Impacted Files	Coverage Δ
proto/col_low_cardinality.go	66.31% <0.00%> (ø)

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