fix: block creation of floorplan without image

ietf/meeting/migrations/0014_alter_floorplan_image.py

@@ -0,0 +1,25 @@
+# Copyright The IETF Trust 2025, All Rights Reserved
+
+from django.db import migrations, models
+import ietf.meeting.models
+import ietf.utils.storage
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("meeting", "0013_correct_reg_checkedin"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="floorplan",
+            name="image",
+            field=models.ImageField(
+                default=None,
+                storage=ietf.utils.storage.BlobShadowFileSystemStorage(
+                    kind="", location=None
+                ),
+                upload_to=ietf.meeting.models.floorplan_path,
+            ),
+        ),
+    ]

ietf/meeting/models.py

@@ -530,7 +530,7 @@ class FloorPlan(models.Model):
     image   = models.ImageField(
         storage=BlobShadowFileSystemStorage(kind="floorplan"),
         upload_to=floorplan_path,
-        blank=True,
+        blank=False,
         default=None,
     )
     #