Revert "[FIX] Crash in base_user_role when role_id is not set on res.users.role.line"

This reverts commit b537941d5a.

base_user_role/models/user.py

@@ -62,7 +62,6 @@ class ResUsers(models.Model):
                 lambda rec: rec.is_enabled)
             for role_line in role_lines:
                 role = role_line.role_id
-                if role:
                 group_ids.append(role.group_id.id)
                 group_ids.extend(role.implied_ids.ids)
             group_ids = list(set(group_ids))    # Remove duplicates IDs

base_user_role/views/user.xml

@@ -13,7 +13,7 @@
             <page string="Roles">
                 <field name="role_line_ids" nolabel="1">
                     <tree editable="bottom" decoration-muted="not is_enabled">
-                        <field name="role_id" required="1"/>
+                        <field name="role_id"/>
                         <field name="date_from"/>
                         <field name="date_to"/>
                         <field name="is_enabled"/>