fix flaky test for navigating to course show page
fix flaky test for navigating to course show page

If a course does not have a title, then on the explorer page it will show
"Title Not Found", but on the show page it will show an empty string. So, make
a course's long string default to "Title Not Found."

JKobyP/the_jolly_advisor,hacsoc/the_jolly_advisor,hacsoc/the_jolly_advisor,JKobyP/the_jolly_advisor,hacsoc/the_jolly_advisor,JKobyP/the_jolly_advisor