[Echo extension] Mention notification text broken if there is no section
completed by: Theo Patt
mentors: Bartosz Dziewoński
Needs finding out the place where the link is constructed (just search for the message key that's used there), if()-ing out the case where section is empty and adding and using a new message there. See this bug report for more information. Students are required to read Wikimedia's general instructions first.