fix(notify): handle KeyboardInterrupt gracefully

shiftregister/feedback/management/commands/notify.py

@@ -28,6 +28,12 @@ class Command(BaseCommand):
         )
 
     def handle(self, *args, **options):
+        try:
+            self._handle(*args, **options)
+        except KeyboardInterrupt:
+            self.stderr.write()
+
+    def _handle(self, *args, **options):
         with options["numbers"].open() as f:
             numbers = json.load(f)