docs: def clean(self, value):
          """Validates that the input can be converted to a list of decimals."""
          if not value:
              return None
  
          # if any value exists, then add "0" as a placeholder to the remaining
          # values.
          if isinstance(value, list) and any(value):
              for i, item in enumerate(value):
                  if not item:
                      value[i] = '0'
  
          return super(MultipleDecimalField, self).clean(value)