Returns the alternate description of a parameter.
        Only pipeline prompt-when-run parameters
        can have alternate names and alternate descriptions

def get_alt_description(self):
        """
        Returns the alternate description of a parameter.
        Only pipeline prompt-when-run parameters
        can have alternate names and alternate descriptions
        """
        if 'altDescription' in self.attributes and bool(self.attributes['altDescription'].strip()):
            return self.attributes['altDescription']
        else:
            return None