Deleting column used in grouping should remove grouped_df attribute #2031
If the user has a grouped_df and sets one of the coulumns used in the grouping to NULL this should remove the grouped_df attribute and make it a regular tbl.
Currently, if the user sets a column used as a grouping to NULL, and then tries to rename a different column, this causes the R session to abort.
At this point the R session will crash.
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