mysql_get_server_version() returns 0 if version_string is set to empty in maxscale.cnf file

We found an issue while connecting through maxscale using SQLyog. SQLyog/MONyog supports only > 4.0 servers. To check this we are executing mysql_get_server_version() and checking the version is > 4.0 or not. But in maxscale, when version_string is set to empty in maxscale.cnf file, mysql_get_server_version() returns "0" and SQLyog returns an error.

I am not sure whether the issue is related MariaDB C connector or maxscale.

According to the documentation, version_string parameter sets a custom version string that is sent in the MySQL Handshake from MariaDB MaxScale to clients.
Example:
version_string=5.5.37-MariaDB-RWsplit

If not set, the default value is the server version of the embedded MySQL/MariaDB library. Example: 5.5.35-MariaDB

MaxScale version: 2.2.3