CalculateAll doesn't work with groupdate v4 series

[ameft]

Just a quick note, I tried CalculateAll with groupdate 4.1.1 and noticed it didn't show dates when there are empty values, then I tried version 3.2.1 and got it working as expected, but it would be nice to have the improvements in v4.

[ankane]

@ameft I created a PR for this a while back #7

[sigra]

For people who are looking for decision — here is a workable fork https://github.com/ankane/calculate-all

Thanks, @ankane