message: Fix NoneType bug & fill the test recipients with original recipients if empty
diff: @@ -90,9 +90,12 @@ class EmailScheduleView(SupersetModelView, DeleteMixin):
  edit_form_extra_fields = add_form_extra_fields
  def process_form(self, form, is_created):
  - recipients = form.test_email_recipients.data.strip() or None
  + if form.test_email_recipients.data:
  + test_email_recipients = form.test_email_recipients.data.strip()
  + else:
  + test_email_recipients = None
  self._extra_data['test_email'] = form.test_email.data
  - self._extra_data['test_email_recipients'] = recipients
  + self._extra_data['test_email_recipients'] = test_email_recipients
  def pre_add(self, obj):
  try:
  @@ -111,7 +114,7 @@ class EmailScheduleView(SupersetModelView, DeleteMixin):
  def post_add(self, obj):
  # Schedule a test mail if the user requested for it.
  if self._extra_data['test_email']:
  - recipients = self._extra_data['test_email_recipients']
  + recipients = self._extra_data['test_email_recipients'] or obj.recipients
  args = (self.schedule_type, obj.id)
  kwargs = dict(recipients=recipients)
  schedule_email_report.apply_async(args=args, kwargs=kwargs)
  