remove unuseful output from tests

Author: mxlian

tests.py

@@ -6,4 +6,5 @@
 class ManagementTest(TestCase):
 
     def test_variable_settings_initialize(self):
-        call_command('variable_settings_initialize')
+        with open('/dev/null', 'w') as f:  # avoids annoying output
+            call_command('variable_settings_initialize', stdout=f)