:space_invader: more fixing bug on nil flash messages
:space_invader: more fixing bug on nil flash messages

nypl-spacetime/nypl-warper,nypl-spacetime/nypl-warper,NYPL/nypl-warper,NYPL/nypl-warper,nypl-spacetime/nypl-warper,nypl-spacetime/nypl-warper,NYPL/nypl-warper,NYPL/nypl-warper