Potential bug in empty column computations in DataFrame #5836
Description
If a PrimitiveDataFrameColumn<T> is empty, and CumulativeMax is called, a null dereference may occur and cause a crash. See https://source.dot.net/#Microsoft.Data.Analysis/PrimitiveDataFrameColumnComputations.cs,264
The fix is simple, but it needs to be applied to the tt file. Many computation APIs are affected. The fix should also apply to DateTImeComputations.cs