set shortId undefined when custom shortId not set

2 jobs for 534-fix-create-room-without-custom-session-code in 6 minutes and 22 seconds (queued for 1 second)
Status Job ID Name Coverage
  Codestyle
passed #246068
nodejs
tslint

00:01:51

 
  Build
passed #246069
angular
ngbuild

00:04:30