old_contents: #!/usr/bin/env python
  # vim: ai ts=4 sts=4 et sw=4
  
  INSTALLED_HANDLERS = None
  EXCLUDED_HANDLERS = []
  
new_contents: #!/usr/bin/env python
  # vim: ai ts=4 sts=4 et sw=4
  
  INSTALLED_HANDLERS = None
  EXCLUDED_HANDLERS = []
  RAPIDSMS_HANDLERS_EXCLUDE_APPS  = []
subject: fix attribute error on handlers loading (cherry picked from commit cd9e9efd8587b5be9e3d9a4e7efeaf26b048b0d2)