fix: Fix issue in tabular lime sampler

[mhamilton723]

#[1049]

Thanks to @memoryz for finding this!

[mhamilton723]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov]

Codecov Report

Merging #1058 (74d4721) into master (663d965) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1058      +/-   ##
==========================================
- Coverage   84.97%   84.95%   -0.02%     
==========================================
  Files         203      203              
  Lines        9689     9685       -4     
  Branches      558      564       +6     
==========================================
- Hits         8233     8228       -5     
- Misses       1456     1457       +1     

Impacted Files	Coverage Δ
.../main/scala/com/microsoft/ml/spark/lime/LIME.scala	94.33% <100.00%> (-0.21%)	⬇️
.../execution/streaming/continuous/HTTPSourceV2.scala	92.08% <0.00%> (-0.72%)	⬇️
...osoft/ml/spark/io/http/PartitionConsolidator.scala	95.74% <0.00%> (+2.12%)	⬆️

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