[SSSD] [PATCH] memberof: check for empty arrays to avoid segfaults

[Sumit Bose]

Hi,

I'm quite confident that this patch can fix
https://fedorahosted.org/sssd/ticket/2430 . Unfortunately I have no idea
how to reproduce a condition which would trigger this issue, so I'm on
completely sure. Any ideas for reproducers are welcome.

bye,
Sumit