Steps to reproduce:

1. Open media type with password (Jabber, Ez Texting, Email)
2. Clone media type
3. Change name and try to save

Result: Appears message "Field "passwd" is required for media type ...". When a user clones media type, there is button "Change password" that looks like you are cloning a password.
Expected: The "Change password" button doesn't appear and user sees empty password field at once.

Password in media type Email is not mandatory in 4.0+ versions ZBX-13357