CRM Notification fails when WhatsApp message has no assigned user (`to_user` mandatory error)

[nilpatel42]

When receiving an incoming WhatsApp message via frappe_whatsapp webhook, a CRM Notification is created automatically.
If no user is assigned (agent is None), the system throws a MandatoryError because to_user is required.

This causes the webhook request to fail even though the WhatsApp message is successfully received

Error

frappe.exceptions.MandatoryError:
[CRM Notification]: to_user

Behavior

• Webhook crashes when to_user is None

Notes

• Happens for incoming WhatsApp messages
• Triggered from crm/api/whatsapp.py → notify_agent → notify_user
• assigned_users can be [None]