Quiz Import: unable to import Cloze question because of "generalfeedback" column

I am unable to import any Cloze question. All attempts end with the following error message:

ERROR: null value in column "generalfeedback" violates not-null constraint

INSERT INTO mdlspa_question ( ID, CATEGORY, NAME, QUESTIONTEXT, DEFAULTGRADE, QTYPE, STAMP ) VALUES ( 21, 3, '::A simple Cloze question:: ', '::A simple Cloze question:: This question consists of some text with an answer embedded right here

and right after that you will have to deal with this short answer

and finally we have a floating point number

. Note that addresses like www.moodle.org and smileys all work as normal: a) How good is this?

b) What grade would you give it?

Good luck! ', 8, 'multianswer', 'www.agenturaspa.cz.web4ce.cz+070820170240+12NB4D' )

• line 1425 of lib/dmllib.php: call to debugging()
• line 234 of question/format.php: call to insert_record()
• line 181 of question/import.php: call to qformat_default->importprocess()

I am attaching the file to be imported (it is the question from http://moodle.org/help.php?module=quiz&file=multianswer.html)