Hide draw export button sooner to avoid that double exports

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

draw/consumers.py

@@ -979,16 +979,16 @@ class DrawConsumer(AsyncJsonWebsocketConsumer):
         if not await Draw.objects.filter(tournament=self.tournament).aexists():
             return await self.alert(_("The draw has not started yet."), 'danger')
 
+        await self.channel_layer.group_send(f"volunteer-{self.tournament.id}",
+                                            {'tid': self.tournament_id, 'type': 'draw.export_visibility',
+                                             'visible': False})
+
         # Export each exportable pool
         async for r in self.tournament.draw.round_set.all():
             async for pool in r.pool_set.all():
                 if await pool.is_exportable():
                     await pool.export()
 
-        await self.channel_layer.group_send(f"volunteer-{self.tournament.id}",
-                                            {'tid': self.tournament_id, 'type': 'draw.export_visibility',
-                                             'visible': False})
-
     @ensure_orga
     async def continue_final(self, **kwargs):
         """