continue execution even if there is nothing to migrate so that signal…

…s fire and loaddata runs

nashvegas/management/commands/upgradedb.py

@@ -158,8 +158,7 @@ def execute_migrations(self, show_traceback=False):
         migrations = self._filter_down()
 
         if not len(migrations):
-            print "There are no migrations to apply."
-            return
+            sys.stdout.write("There are no migrations to apply.\n")
 
         created_models = []