Duplicated code in CompoundMessage.__repr__

[Yancey0623]

The if and else branch have the same code:

pysqlflow/sqlflow/compound_message.py

Lines 34 to 39 in da0fffd

	for r in self._messages:
	if isinstance(r[0], Rows):
	all_string = '\n'.join([all_string, r[0].__repr__()])
	else:
	all_string = '\n'.join([all_string, r[0].__repr__()])
	return all_string

[AayushTyagi1]

Can I work on this issue?

[AayushTyagi1]

@Yancey1989 I have solved this issue, please review