[issue#12603][FIX] invoice_xunnel: Avoid traceback when l10n_mx_edi_cfdi_uuid is False
#12603
This MR is reference to TicketAvoid error when field l10n_mx_edi_cfdi_uuid is False
AttributeError: 'bool' object has no attribute 'lower'
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Edited by Edilianny Sánchez