webadmin: NPE in Picking first provider

Fix assumption that first provider exists

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1144807
Change-Id: I71d1249d86a6b700708391eb19ba98302dd0be4a
Signed-off-by: Yaniv Bronhaim <ybronhei@redhat.com>