Fix table sorting

[maciaszczykm]

Fixes #571.

CC @bryk @kwodzynski

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This change is

[codecov-io]

Current coverage is 86.89%

Merging #594 into master will not affect coverage as of 6ba8d59

@@            master    #594   diff @@
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  Files          102     102       
  Stmts          870     870       
  Branches         0       0       
  Methods          0       0       
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  Hit            756     756       
  Partial          0       0       
  Missed         114     114       

Review entire Coverage Diff as of 6ba8d59

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[bryk]

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Reviewed 2 of 2 files at r1.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from the review on Reviewable.io