(ok 3.2.4) Empty default value not set properly

phpMyAdmin 3.2.3, Apache/2.2.13 (Unix), PHP/5.2.11

When editing VARCHAR field's structure that has empty string set as a default value the Default menu has 'None' preselected instead of 'As defined:'. The 'As defined:' should be preselected if the field has default value set, even if it is an empty sting.

If the default value is anything else than an empty string the 'As defined:' is correctly preselected with the correct string in the value field below.