Merge branch 'master' of https://git.eleves.ens.fr/cof-geek/gestioCOF into Aufinal/bda_shotgun

bda/views.py

@@ -333,7 +333,9 @@ def revente(request, tirage_id):
                 revente = rev.get()
                 revente.date = timezone.now() - timedelta(hours=1)
                 revente.soldTo = None
-                revente.answered_mail = None
+                if revente.answered_mail:
+                    revente.answered_mail.clear()
+                revente.save()
 
         else:
             resellform = ResellForm(participant, prefix='resell')