webadmin: Disable new Pools popup when no Templates are available

Disable the pool New popup window when there are no Templates
other than Blank

Change-Id: Iacb121d2e89922b04b8331db92e437cefc8b6b5c
Bug-Url: https://bugzilla.redhat.com/864363
Signed-off-by: Kobi Ianko <kobi@redhat.com>