Fix decrementing tasks left for non-task exercises #70
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If the
Column.isTask
function does not report a content type to be a task (usually scorable), but the content type sends out xAPI statements, then Interactive Book may decrease the number of tasks left by 1 and this leads to a wrong count of interactions on the summary screen.This can, for instance, happen for Agamotto that is not considered to be a task (not scored), but sends out xAPI
completed
once all images have been shown.When merged in, the number of tasks left will only be reduced by 1 if the instance at hand is considered to be a task.