DBC22-1449: fixed bad default value in migration

Author: ray-oxd

src/backend/apps/cms/migrations/0013_alter_advisory_body_alter_bulletin_body_and_more.py

@@ -27,10 +27,9 @@ class Migration(migrations.Migration):
             model_name='bulletin',
             name='image',
             field=models.ForeignKey(
-                default=None,
+                null=True,
                 on_delete=django.db.models.deletion.CASCADE,
                 to='wagtailimages.image'
             ),
-            preserve_default=False,
         ),
     ]

src/backend/apps/cms/models.py

@@ -53,7 +53,7 @@ class Bulletin(Page, BaseModel):
     page_body = "Use this page for creating bulletins."
     teaser = models.CharField(max_length=250, blank=True)
     body = RichTextField()
-    image = models.ForeignKey(Image, on_delete=models.CASCADE)
+    image = models.ForeignKey(Image, on_delete=models.CASCADE, null=True, blank=False)
 
     def rendered_body(self):
         return wagtailcore_tags.richtext(self.body)