[FIX] sale_invoice_blocking: return text in _nothing_to_invoice_error_message #4087
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Return error message directly instead of a UserError to prevent an error when this module is used together with the enterprise subscription module which tries to append its own message:
result = _call_kw_multi(method, model, args, kwargs)
File "/opt/odoo/src/odoo/odoo/api.py", line 469, in _call_kw_multi
result = method(recs, *args, **kwargs)
File "/opt/odoo/src/enterprise/sale_subscription/models/sale_order.py", line 731, in action_invoice_subscription
raise UserError(self._nothing_to_invoice_error_message())
File "/opt/odoo/src/enterprise/sale_subscription/models/sale_order.py", line 1534, in _nothing_to_invoice_error_message
error_message += _(
TypeError: unsupported operand type(s) for +=: 'UserError' and 'str'