Harmonize getAnswerGiven with other content types #32
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The function getAnswerGiven should report true if an answer has been given.
Other content types return true if either an answer has been given explicitly
or nothing has been answered explicity, but "check" has been clicked.
True-False did not do the latter. In Course Presentation, this led to inconsistent behavior in the navigation bar. Other content types would report true when clicking on the check button even without giving an answer and the dot on the slide's navigation bar would be filled. It would not be filled for TrueFalse however if no answer was chosen before clicking on the check button.