On qa.moodle.net, I exported the 4 questions in the question bank. The matching question has a blank question for which the answer is chat. When this is exported to GIFT nothing is there and thus it breaks the file on import. See below what gets exported:

// question: 2 name: Moodle activities
::Moodle activities::[html]<div class\="text_to_html">Match the activity to the description.</div>{
=<div class
="text_to_html">An activity supporting asynchronous discussions.</div> -> Forum
=<div class
="text_to_html">A teacher asks a question and specifies a choice of multiple responses.</div> -> Choice
=<div class
="text_to_html">A bank of record entries which participants can add to.</div> -> Database
=<div class
="text_to_html">A collection of web pages that anyone can add to or edit.</div> -> Wiki
= -> Chat
}

I'm not sure how you want to handle this scenario. Perhaps do a quick check that the question is not empty and if it is export a single   or something. This seems like a somewhat unlikely case but since it came up during QA testing I'm setting the priority to major. Peace - Anthony