code: def clear_list_value(self, value):
          
          # Don't go any further: this value is empty.
          if not value:
              return self.empty_value
          # Clean empty items if wanted
          if self.clean_empty:
              value = [v for v in value if v]
          return value or self.empty_value
docs: Clean the argument value to eliminate None or Falsy values if needed.