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fix null subquestions and choices

Authored by patte <patrick.recher@gmail.com> on May 6 2016, 17:48.

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fix null subquestions and choices

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patte <patrick.recher@gmail.com> committed R7177:94efe1b9dcd7: fix null subquestions and choices (authored by patte <patrick.recher@gmail.com>).May 6 2016, 17:48