fix bug by ensuring argument passed to datetime.strptime is not False ; if…

fix bug by ensuring argument passed to datetime.strptime is not False ; if False, member is assumed to be exempted at date

lacagette_addons/lacagette_membership/models/shift_template.py

@@ -20,8 +20,8 @@ class ShiftTemplate(models.Model):
             rec_date = datetime.strptime(rec_date, '%Y-%m-%d')
             for l in partner.leave_ids:
                 #_logger.debug("leave start end : %s %s", str(l.start_date), str(l.stop_date))
-                if (rec_date >= datetime.strptime(l.start_date, '%Y-%m-%d') and
-                   rec_date <= datetime.strptime(l.stop_date, '%Y-%m-%d')):
+                if (l.start_date is False or rec_date >= datetime.strptime(l.start_date, '%Y-%m-%d') and
+                   l.stop_date is False or rec_date <= datetime.strptime(l.stop_date, '%Y-%m-%d')):
                    answer = True
                    #_logger.debug("Partner will be still exempted")