old_contents: 
  from django.dispatch import Signal
  
  form_invalid = Signal(providing_arguments=["form"])
  form_valid = Signal(providing_arguments=["form", "entry"])
  
new_contents: 
  from django.dispatch import Signal
  
  form_invalid = Signal(providing_args=["form"])
  form_valid = Signal(providing_args=["form", "entry"])
  
subject: Fix Signal call