MFC r322677: pw usermod: handle empty secondary group lists (-G '')
"pw usermod someuser -G ''" is supposed make sure that someuser
doesn't have any secondary group memberships.
Previouly it was a nop because split_groups() only intitialised
"groups" if at least one group was specified. As a result the
existing secondary group memberships were kept.
Submitted by: Fabian Keil
Approved by: re (kib)
Obtained from: ElectroBSD