[IMP]pms: refactor workflow mails

pms/models/pms_service_line.py

@@ -2,10 +2,13 @@
 # Copyright 2017  Dario Lodeiros
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
 import datetime
+import logging
 
 from odoo import _, api, fields, models
 from odoo.exceptions import ValidationError
 
+_logger = logging.getLogger(__name__)
+
 
 class PmsServiceLine(models.Model):
     _name = "pms.service.line"