Empty queue default messages

[helllllllder]

I'm submitting a ...

• bug report
• feature request

What is the current behavior?

Deleted the default message on the front end, but the contact still receive it, now an empty message

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem

Using the default message editor on the front end, remove the text or create it empty
When a contact sends a message to the queued room, it'll receive the empty message as default message

What is the expected behavior?

The system shouldn't return the default message if it's an empty string

What is the motivation / use case for changing the behavior?

For the contact stop receiving empty messages.