Cannot leave group

[cnorris23]

Leaving a group failed to work. BP_Groups_Member::delete() always returned true, so I cast $delete_result as an integer. I also added some feedback to let users know they either can't leave the group as the only admin, or that they've successfully left the group.

I did have one question. In the groups leave function there is this line

if ( !groups_uninvite_user( $user_id, $group_id, true ) )

The groups_uninvite_user() function doesn't accept the 'true' parameter. However, BP_Groups_Member::delete(), accepts $check_empty parameter, which defaults to true. The string $check_empty isn't used anywhere in the BP_Groups_Member::delete() function. Are the extra parameters something we should lose?

[apeatling]

Yes the params are deprecated and should be removed.

[apeatling]

(In [2582]) Fixes #1801