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Problem blocks offer a setting to make users wait a set time between submissions. If a course is not authored in studio, it might not set a value for this setting. Consequently, the problem block must handle the submission_wait_seconds field to be none, so it doesn't break the submitted responses. These kinds of errors here will prevent learners from submitting any answer, and has for several learners. Adding in this one-line change will prevent future errors without having to change the authoring practices of those ambitious enough to write their courses with import. This also catches the case that some internal process other than studio might be creating problems with "none" as the setting. In response to TNL-8234 Testing: hand-testing by importing the following problem xml file within a course and attempting to answer as learner(answer is 10.4).
common ------ This directory contains common code shared between LMS and CMS, such as Mako templates, CSS, and Coffescript.