core: fix default Null causing issues in translation

passbook/core/migrations/0010_auto_20200221_2208.py

@@ -0,0 +1,33 @@
+# Generated by Django 3.0.3 on 2020-02-21 22:08
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("passbook_core", "0009_auto_20200221_1410"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="application",
+            name="meta_description",
+            field=models.TextField(blank=True, default=""),
+        ),
+        migrations.AlterField(
+            model_name="application",
+            name="meta_icon_url",
+            field=models.TextField(blank=True, default=""),
+        ),
+        migrations.AlterField(
+            model_name="application",
+            name="meta_launch_url",
+            field=models.URLField(blank=True, default=""),
+        ),
+        migrations.AlterField(
+            model_name="application",
+            name="meta_publisher",
+            field=models.TextField(blank=True, default=""),
+        ),
+    ]