Deactivate Domainalias

============ Required information ====
- iRedMail version: iRedAdmin-Pro-MySQL 1.7.0
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: Ubuntu 12.04
- Related log if you're reporting an issue:
====

I create a list of all active domains and domainaliase via cron with my sqlscript.

SELECT domain from domain WHERE active=1;
SELECT alias_domain from alias_domain WHERE active=1;

Now I´ve registered that domainaliases of deactivated domains are not marked as beeing deactivated.

i.e.:
domain: DomainA
active: 0
but
alias_domain: AliasofDomainA
target_domain: DomainA
active: 1

Is it a bug or a feature or is my config broken?