fix reference to stage ID

internals/maintenance_scripts.py

@@ -806,13 +806,14 @@ def calc_needs_work_started_on(
 class SendManualOTCreatedEmail(FlaskHandler):
   """Manually send an email to origin trial contacts that an origin trial has
   been created but not yet activated."""
-  def get_template_data(self):
+
+  def get_template_data(self, **kwargs):
     self.require_cron_header()
 
-    stage_id = self.get_param('stage_id')
+    stage_id = kwargs.get('stage_id')
     stage: Stage|None = Stage.get_by_id(stage_id)
     if not stage:
-      self.abort(400, f'Stage {stage_id} not found')
+      return f'Stage {stage_id} not found'
 
     cloud_tasks_helpers.enqueue_task(
         '/tasks/email-ot-creation-processed',
@@ -823,13 +824,14 @@ def get_template_data(self):
 class SendManualOTActivatedEmail(FlaskHandler):
   """Manually send an email to origin trial contacts that an origin trial has
   been created and also activated."""
-  def get_template_data(self):
+
+  def get_template_data(self, **kwargs):
     self.require_cron_header()
 
-    stage_id = self.get_param('stage_id')
+    stage_id = kwargs.get('stage_id')
     stage: Stage|None = Stage.get_by_id(stage_id)
     if not stage:
-      self.abort(400, f'Stage {stage_id} not found')
+      return f'Stage {stage_id} not found'
 
     cloud_tasks_helpers.enqueue_task(
         '/tasks/email-ot-activated',