LDEV-1248: Answers hidden in monitor were still showing in learner. Updated the export portfolio jsp so that it indicates hidden in the class view, and hides other students' answers that are marked as hidden in the learner view. In the same way, the two learner summary screens now only show a "hidden" response if it is the learner's own response.
LDEV-1225: Page wasn't working if the learner had started the activity but hadn't saved their entry. Now if there isn't an entry, it shows the normal page but skips the entry section.
LDEV-1225: Page wasn't working if the learner had started the activity but hadn't saved their entry. Now if there isn't an entry, it shows the normal page but skips the entry section.
