Backport PR #27631 on branch 0.25.x (BUG: raise when wrong level name is passed to "unstack")#27640

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jreback merged 1 commit intopandas-dev:0.25.xfrom

meeseeksmachine:auto-backport-of-pr-27631-on-0.25.x

Jul 30, 2019

Commits on Jul 29, 2019

Backport PR #27631: BUG: raise when wrong level name is passed to "unstack"

toobaz
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