Check for a corner case where a user comes back to the referral step after already setting an email.
Check for a corner case where a user comes back to the referral step after already setting an email.

jtakayama/ics691-setupbooster,justinslee/Wai-Not-Makahiki,csdl/makahiki,jtakayama/ics691-setupbooster,csdl/makahiki,yongwen/makahiki,csdl/makahiki,jtakayama/ics691-setupbooster,jtakayama/makahiki-draft,csdl/makahiki,yongwen/makahiki,yongwen/makahiki,yongwen/makahiki,jtakayama/makahiki-draft,jtakayama/makahiki-draft,jtakayama/makahiki-draft