fix bug for Kruskal Wallis Test #227
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fixes #148.
The Kruskal Wallis test requires there to be some underlying variation within the dataset. That means that the test should fail when provided with samples that are all of the same value.
This fix inserts a check for the first rank and the last rank within
kruskalWallisRank. If the first rank is the same as the last rank, then there is no underlying variation, andNothingis returned and propagated forward.