Make complete_part more robust #547
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up_through should never be higher than the total number of exercises in a lesson.
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When working with swirl on DataCamp, it happens that the
e$test_fromexceeds the actual number of exercises in the lesson. This gave nasty side effects.I added an extra check that only does
complete_part()ife$test_fromis lower thannrow(e$les). Otherwise,e$test_fromis simply reset to 1.