Filter out config that would be empty string

[bharrisau]

fixes #86

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.28% ⚠️

Comparison is base (ba9df19) 52.45% compared to head (fe515e0) 52.18%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #87      +/-   ##
==========================================
- Coverage   52.45%   52.18%   -0.28%     
==========================================
  Files          13       13              
  Lines        1098     1098              
==========================================
- Hits          576      573       -3     
- Misses        522      525       +3     

Files Changed	Coverage Δ
src/execution_providers.rs	56.25% <ø> (ø)

... and 1 file with indirect coverage changes

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