Added a message if apt cacher ng configuration does not exist (refs #21177).

6.CampusManager/2.Configure_apt_cacher_ng/0_setup.py

@@ -22,3 +22,5 @@ def setup(interactive=True):
             utils.log('File "%s" updated.' % path)
         else:
             utils.log('File "%s" already up to date.' % path)
+    else:
+        utils.log('The configuration file "%s" does not exist, nothing to do.' % path)