match test errors with an empty message

[bhcleek]

No description provided.

[codecov-io]

Codecov Report

Merging #1664 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1664      +/-   ##
==========================================
+ Coverage   22.34%   22.36%   +0.01%     
==========================================
  Files          53       53              
  Lines        4224     4225       +1     
==========================================
+ Hits          944      945       +1     
  Misses       3280     3280

Flag	Coverage Δ
#nvim	16.92% <0%> (-0.01%)	⬇️
#vim74	19.4% <100%> (+0.01%)	⬆️
#vim80	21.15% <100%> (+0.01%)	⬆️

Impacted Files	Coverage Δ
autoload/go/test.vim	72.47% <100%> (+0.15%)	⬆️

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