Users created by the LDAP login handler have password_hash_type = 0 and password_hash is empty string. On login the standard login handler runs first. It currently doesn't recognise these users and logs an error:
Password hash type ID '0' is not recognized. Defaulting to eZUser::DEFAULT_PASSWORD_HASH.

We should accept this case without errors.

Steps to reproduce:

• Set up the LDAP login handler after the standard login handler
• Or (simpler), set up the Textfile login handler after the standard login handler
• Or (simplest), manually edit the ezuser table for a regular user and set password_hash_type = 0 and password_hash to empty string. Login won't work for this user, before or after the fix, but that's ok.
• Log in as an LDAP / textfile / manually hacked user
• Check the error.log for the message mentioned above. Expected after fix: No error message in the log.
• Manually edit another user, set password_hash_type = 42
• Log in as this user. Expected before and after fix: Login will fail, and the error message above will show in the log.