Support sending messages when a rule no longer matches and fix dual-use notification sender

core/migrations/0022_notificationrule_send_empty_and_more.py

@@ -0,0 +1,23 @@
+# Generated by Django 4.1.5 on 2023-01-15 23:34
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0021_notificationrule_amount_and_more'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='notificationrule',
+            name='send_empty',
+            field=models.BooleanField(default=False),
+        ),
+        migrations.AlterField(
+            model_name='notificationrule',
+            name='amount',
+            field=models.PositiveIntegerField(blank=True, default=1, null=True),
+        ),
+    ]