The Export Good feature does not work. Error = No questions have been added yet

Once students have created questions it is supposed to be possible for the teacher to export only those "questions with grade equal or better than x%". This export function can be carried out in the the Export Good tab of the Teacher GUI of the Question Creation activity.

When using clicking on this tab, and selecting '0 - (All questions) in the "Export only these questions" section, the export is carried out as expected. However, when certain percentage points are specified, the following error message appears:

No questions have been added yet

More information about this error

and the second line of this error message is a link to:
http://docs.moodle.org/en/error/quiz/noquestions

In fixing this bug, it also needs to be made clear that the percentage score that is selected in 'grade equal to or better than' sectiion is for Manual grading ONLY. In other towards, there needs to be a message at the top of the screen telling teachers that if questions were not manually graded, the 'Export Good' tab will not work as expected - or will not work at all.