Don't create testset if no test to run

[nickrobinson251]

same as #319 but for the newly added test from #313

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.93%. Comparing base (484c23f) to head (ff8d922).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Aqua.jl	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #332   +/-   ##
=======================================
  Coverage   86.93%   86.93%           
=======================================
  Files          11       11           
  Lines         513      513           
=======================================
  Hits          446      446           
  Misses         67       67           

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[lgoettgens]

Thanks! I must have missed that in the review

[nickrobinson251]

thanks for the quick merge!