Don't crash when checking "owner" ACLs with shared namespaces.
Don't crash when checking "owner" ACLs with shared namespaces.

damoxc/dovecot,Distrotech/dovecot,Distrotech/dovecot,damoxc/dovecot,damoxc/dovecot,damoxc/dovecot,Distrotech/dovecot,Distrotech/dovecot,Distrotech/dovecot,damoxc/dovecot