Fixes
https://fedorahosted.org/sssd/ticket/1152
I just made the get_naming_context() routine non-fatal and added NULL
checks for the search bases in each of the routines that use them. So if
SOME features have search bases available, they'll work. This will ease
issues on upgrade.
Note: some other patches in development (such as AutoFS and SELinux)
will probably need to be updated to include these NULL checks as well.