[BUG] allow metric classes to be called with multilevel arg if series is not hierarchical
#6418
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fkiraly
added
bugfix
fkiraly
requested review from
achieveordie,
benHeid and
yarnabrina
as code owners
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This PR allows metric classes to be called with
multilevelarg in all cases, if the series is not hierarchical. Previously, this would crash the metric.This PR changes behaviour in this degenerate case so a single-entry
pd.DataFrameis returned.Fixes #6413