Configuration File: not configured (no replies)

I can connect to a mysql database via Socket/Pipe but when I look at the page "Options File" the following message is displayed at the bottom of mysql-workbench although there is a configuration file in a default place (/etc/my.cnf):

Configuration File: not configured


Can I set the path to the configuration file manually?


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System info
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MySQL Workbench Community (GPL) for Linux/Unix version 6.2.4 revision 12437 build 2426 (64 bit)
Configuration Directory: /home/mer/.mysql/workbench
Data Directory: /usr/share/mysql-workbench
Cairo Version: 1.14.0
OS: Linux 3.19.8-server-3.mga5
CPU: 40x Intel(R) Xeon(R) CPU E5-2687W v3 @ 3.10GHz (1291.707MHz) - 251,81GiB RAM
Distribution: Mageia 5

Prepared options set for server version '(10, 0, 20)' on 'linux' platform: added - 0, skipped - 570, skipped with no value - 0, deprecated - 0
Prepared options set for server version '(5, 7)' on 'linux' platform: added - 446, skipped - 95, skipped with no value - 29, deprecated - 0
Traceback (most recent call last):
File "/usr/lib64/mysql-workbench/modules/wb_admin_config_file_ui.py", line 1096, in config_apply_changes_clicked
self.cfg_be.apply_changes()
File "/usr/lib64/mysql-workbench/modules/wb_admin_config_file_be.py", line 1084, in apply_changes
if lines_range[1] >= 0:
TypeError: 'NoneType' object has no attribute '__getitem__'