amend incorrect stddev test description and add additional test for singleton list as per spec example

dmn-tck / tck

Decision Model and Notation Technology Compatibility Kit

https://dmn-tck.github.io/tck

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amend incorrect stddev test description and add additional test for singleton list as per spec example #655

Closed StrayAlien closed 7 months ago

StrayAlien commented 8 months ago

test description said it was expecting a non-null value - which is incorrect. Also, another test in there to cover the example in the spec of a singleton list as a param.