possible solution to nullPointerException in InstructorCourseEditPage
modify asp file to not show the join link element in source code if the key does not exist
Revert "modify asp file to not show the join link element in source code if the key does not exist"

This reverts commit b42875f5640d500d079d40570ebb6c2f6bc1709c.
[2242] instructorCourseEdit: Null pointer exception

fixes #2242
modify jsp to not show join link element when key does not exist
Merge branch 'master' into Issue2242
[2242] instructorCourseEdit: Null pointer exception

fixes #2242
Merge branch 'dev' into rc
Fix student list
fixing tests
Merge branch '75012888' into rc
make search query becomes OR query, instead of AND
Tweak copy session panel
Merge branch 'rc' into Tweaking_for_v5.07
Fix bug for student list and copy sessions
fixed responsiveness issue. Fixed max size to 5MB as a quick fix. added associated tests
Merge branch 'rc' into 75008716
changed 'Undisclosed' to 'Not Specified' for profile fields
tweak ui for comments feature
Tweak UI for student list to show message when search for no results in a course