Determines if value value is empty.
        Keyword arguments:
        value str -- the value of the associated field to compare

def run(self, value):
        """ Determines if value value is empty.
        Keyword arguments:
        value str -- the value of the associated field to compare
        """
        if self.pass_ and not value.strip():
            return True

        if not value:
            return False
        return True