Title: Default for shortanswer null
Course: course with one quiz with one question

Q: so can you give a null answer? or give some data types.

OR

What character do you type between words?
A: ''' / ''
Partly right: integer (90%); boolean (90%)
Feedback ("integer"): gd gd
Feedback ("boolean"): sehr gut
Feedback ("'''"): superman! (this is an answer which is blank.)
Feedback (any other answer): wonderwoman! (this is an answer with a wildcard '*' only)
Feedback ("''"): did you figure out that a space could be accepted?
Feedback ("'"): lots of spaces!
Feedback: hm feedback
  Hint: free for trying again and again.