Fix: DataFrameGroupBy.get_group was raising with length>1 tuples #17653
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Description
#17216 added similar logic to what's in pandas https://github.com/pandas-dev/pandas/blob/602ae10f3d0d599ebbdd151e8a09f0baf20b4637/pandas/core/groupby/groupby.py#L787-L794, but missed one crucial ingredient: checking that the length of the keys is
1
before raisingChecklist
closes #17650