Remove check against move when deleting account period

The period on the move restrict on delete of the foreign key.

modules/account/message.xml

@@ -9,9 +9,6 @@ this repository contains the full copyright notices and license terms. -->
         <record model="ir.message" id="msg_no_open_period_date">
             <field name="text">To continue, you must reopen the period "%(period)s" of company "%(company)s" for the date "%(date)s".</field>
         </record>
-        <record model="ir.message" id="msg_modify_delete_period_moves">
-            <field name="text">You cannot modify or delete period "%(period)s" because it contains moves.</field>
-        </record>
         <record model="ir.message" id="msg_create_period_closed_fiscalyear">
             <field name="text">You cannot create a period in fiscal year "%(fiscalyear)s" because it is closed.</field>
         </record>

modules/account/period.py

@@ -272,17 +272,6 @@ class Period(Workflow, ModelSQL, ModelView):
         else:
             return period
 
-    @classmethod
-    def _check(cls, periods):
-        Move = Pool().get('account.move')
-        moves = Move.search([
-                ('period', 'in', [p.id for p in periods]),
-                ], limit=1)
-        if moves:
-            raise AccessError(
-                gettext('account.msg_modify_delete_period_moves',
-                    period=moves[0].period.rec_name))
-
     @classmethod
     def search(cls, args, offset=0, limit=None, order=None, count=False,
             query=False):
@@ -362,7 +351,6 @@ class Period(Workflow, ModelSQL, ModelView):
 
     @classmethod
     def delete(cls, periods):
-        cls._check(periods)
         super(Period, cls).delete(periods)
         cls._find_cache.clear()