fix(stats): passing value 0 to valueScale

[rsbh]

🐛 Bug Fix

• right now there is a check for the values before calling valueScale which is supposed to check undefined and null value but it is filtering out the value 0
  when an inverted linear scale is passed as valueScale the value 0 is at the top, not the bottom. And values can be 0 and it is a valid value for valueScale function.

[coveralls]

Pull Request Test Coverage Report for Build 465621721

• 5 of 5 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 61.196%

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Totals
Change from base Build 462020185:	0.02%
Covered Lines:	1728
Relevant Lines:	2690

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💛 - Coveralls

[williaster]

Thanks for the fix @rsbh! 🙏 I agree this is the desired behavior 👍

[rsbh]

@williaster what is the ETA on the 1.4.0 release?

[williaster]

@rsbh I was trying to get a few more PRs in this week before release but they'll probably land early next week. If you need the release urgently I can probably get a release out today with this fix.

[rsbh]

Thanks @williaster. This is a bug fix and it will be better to release a patch version instead of waiting for the next major/minor release.

[williaster]

👍 yep, this was a bug fix which would normally be a patch, but there were already new features merged by the time this got in so went ahead with the minor release. 1.4.0 is out now 🎉