[#2978] Check that mysql pointer is non-null
This is a workaround for the libmysqlclient that dereferences mysql ptr in the MYSQL_STMT after reconnect. Kea checks that this pointer is not NULL before using the statement.
Closes #2978
This is a workaround for the libmysqlclient that dereferences mysql ptr in the MYSQL_STMT after reconnect. Kea checks that this pointer is not NULL before using the statement.
Closes #2978