Proper handling of orphaned groups

[PVince81]

Steps:

1. Login as a user "user1"
2. Create a group "customgroup1"
3. Login as admin
4. Delete user "user1"

What happens ?

If "user1" is the only member of the group, automatically delete the group as well.
If there are other members in the group (admin or non-admin), the group stays. If there is no admin in the group, the superadmin (aka ownCloud admin) has the ability to set a group admin for that one.

@pmaier1 @SergioBertolinSG @DeepDiver1975

[pmaier1]

If there are other members in the group (admin or non-admin), the group stays. If there is no admin in the group, the superadmin (aka ownCloud admin) has the ability to set a group admin for that one.

1. Yes
2. Proposal: If there's no admin in the group because the account was deleted then we could automatically give admin privileges to the second added user. Might be kind of arbitrary but depending on the overall oC admin to get privileges back in this case also is not a really nice solution and not very self-service.

[PVince81]

to the second added user

this would require adding a timestamp or increasing numeric value in the members database table so we can sort by added order

[PVince81]

in this case also is not a really nice solution and not very self-service

indeed, good point