Change record status: 
Project: 
Introduced in branch: 
8.x-5.x
Introduced in version: 
8.x-5.5
Description: 

Previously the default email subject settings was using the [webform_submission:source-entity] token which is blank when there is no source entity associated with a webform submission.

Webform default email subject nows uses the [webform_submission:source-title]token which returns the source entity's title when it is available and then defaults to the webform's title when there is no source entity.

Impacts: 
Site builders, administrators, editors