Adapt the random draw for the next rounds of ETEAM

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

draw/models.py

@@ -82,7 +82,7 @@ class Draw(models.Model):
         elif self.current_round.current_pool.current_team is None:
             return 'DICE_ORDER_POULE'
         elif self.current_round.current_pool.current_team.accepted is not None:
-            if self.current_round.number == 1:
+            if self.current_round.number < settings.NB_ROUNDS:
                 # The last step can be the last problem acceptation after the first round
                 # only for the final between the two rounds
                 return 'WAITING_FINAL'
@@ -205,7 +205,7 @@ class Round(models.Model):
 
     current_pool = models.ForeignKey(
         'Pool',
-        on_delete=models.CASCADE,
+        on_delete=models.SET_NULL,
         null=True,
         default=None,
         related_name='+',