[WIP]partner_skills:make skill_id no required

partner_skills/models/partner_skill_line.py

@@ -12,7 +12,7 @@ class PartnerSkillLine(models.Model):
     skill_id = fields.Many2one(
         'partner.skill', compute='_compute_skill_id', store=True,
         domain="[('skill_type_id', '=', skill_type_id)]",
-        readonly=False, required=True, ondelete='cascade')
+        readonly=False, ondelete='cascade')
     # Skill levels are hidden from the UI for now (client request). The field is
     # kept so existing data is preserved and the feature can be re-enabled later.
     skill_level_id = fields.Many2one(