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This patch conbines valuable contributions from Kashmira Nagwekar and Luca Bösch. Many thanks to them. However, the final form of the fix, and hence the blame, falls to me -- Tim. There were several issues here: * The load_questions_usages_by_activity method in question/engine/datalib.php was incorrectly treating the case when no data was returned. (Looks like a historic copy-pase from other methods that fetch one item by unique id, which therefore must exist.) * The report was not correctly handling the display when the 'Which tries' was set to 'with, and without, attempts'. * It was possible to select the 'All tries' option when also saying 'Users without attempts'. This combination makes not sense, so a disabledIf rule was added to the form.