Do not prematurily raise an exception, let the main loop take care of it instead

salt/roster/__init__.py

@@ -82,12 +82,5 @@ class Roster(object):
             except IOError as exc:
                 pass
 
-        if not targets:
-            raise salt.exceptions.SaltSystemExit(
-                    'No hosts found with target {0} of type {1}'.format(
-                        tgt,
-                        tgt_type)
-                    )
-
         log.debug('Matched minions: {0}'.format(targets))
         return targets