Granting access to servers via addon templates (in a multiserver setup)

ISPConfig version 3.1.2, installed on Debian 8

Granting access to specific servers in add-on templates is not working, you must specify them in master templates.

Steps to reproduce:

• Create a master template with no email servers
• Create addon template with specific email server
• Setup client with master and addon template
• Login as client and try to add email domain