Fix attachment upload

There was no default specified for
the open_graph_image flag

attachments/migrations/0007_auto_20201201_1917.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.1.3 on 2020-12-01 18:17
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("attachments", "0006_auto_20201128_2022"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="attachment",
+            name="open_graph_image",
+            field=models.BooleanField(blank=True, default=False),
+        ),
+    ]

attachments/models.py

@@ -30,7 +30,7 @@ class Attachment(models.Model):
     description = models.CharField(max_length=500)
     original_file = AbsoluteUrlFileField()
     processed_file = AbsoluteUrlFileField(blank=True, null=True)
-    open_graph_image = models.BooleanField(blank=True)
+    open_graph_image = models.BooleanField(blank=True, default=False)
 
     objects = AttachmentManager()