REGR: bug in moments when using bottleneck

[jreback]

closes #16116

[TomAugspurger]

Do nanskew, nankurt, and nansem need the same fix too?

[jreback]

done (nansem already hits the nanvar path).

I had changed this code a long time ago (but in 0.20.0) IIRC to simplify. Guess was not fully exercised.

[codecov]

Codecov Report

Merging #16124 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #16124      +/-   ##
==========================================
+ Coverage   90.83%   90.84%   +<.01%     
==========================================
  Files         159      159              
  Lines       50771    50774       +3     
==========================================
+ Hits        46120    46124       +4     
+ Misses       4651     4650       -1

Flag	Coverage Δ
#multiple	88.62% <100%> (ø)	⬆️
#single	40.33% <0%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
pandas/core/nanops.py	98.18% <100%> (+0.01%)	⬆️
pandas/core/common.py	91.03% <0%> (+0.34%)	⬆️

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[jorisvandenbossche]

Thanks!