[BUG]: Fix bug in MultiIndex.drop dropped nan when non existing key was given #37794
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black pandas
git diff upstream/master -u -- "*.py" | flake8 --diff
Additional question:
The doc says (https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Index.drop.html) that
drop
raises when not all labels are found, butdoes not raise, because
1
is found. Should we implement, that it raises every time when at least one of the keys is not found?