Workaround for the issue caused by some versions of suhosin that ignores empty values in POST data
Workaround for the issue caused by some versions of suhosin.
For details see this Joomla Issue #8421
To see if you at all need this plugin or not, you can perform this test on your hosting server and match your result with this.
Please note that this is just a workaround in case you can't update your suhosin version. It is advised that you disable/uninstall this plugin after your have fixed version of suhosin installed.