Fix crash when adding a subline to a listUI entry.
Fix crash when adding a subline to a listUI entry.

This caused a crash when the user was revoked by a contact because we
would try to set the subline text of a label that hadn't been created.

berkus/pond,agl/pond,sillvan/pond,saltthefries/pond,sillvan/pond,ioerror/pond,ioerror/pond,ArneBab/pond,saltthefries/pond,infinity0/pond,agl/pond,ArneBab/pond,berkus/pond,infinity0/pond