Make url for push messages non-required

website/pushnotifications/migrations/0011_message_url.py

@@ -13,6 +13,6 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='message',
             name='url',
-            field=models.CharField(max_length=256, null=True, verbose_name='url'),
+            field=models.CharField(max_length=256, null=True, blank=True, verbose_name='url'),
         ),
     ]

website/pushnotifications/models.py

@@ -98,7 +98,8 @@ class Message(models.Model, metaclass=ModelTranslateMeta):
     url = models.CharField(
         verbose_name=_('url'),
         max_length=256,
-        null=True
+        null=True,
+        blank=True,
     )
     category = models.ForeignKey(
         Category,