User/Empolyee ID , Job Title/Responsibility in User won't get updated

======== Required information ====
- iRedMail version: 0.9.0
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):  LDAP
- Linux/BSD distribution name and version:
- Related log if you're reporting an issue:
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If we put in something in the User/Employee ID , Job Title/Responsibility fields, save it; then clear these fields up (empty them) later on, save it again -- you'll find out that the last info will still be there: