3dc869c257
"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. PR: 221417 Submitted by: Fabian Keil Obtained from: ElectroBSD MFC after: 1 week Relnotes: yes