level loader: use retry mechanism in case of empty playlists
level loader: use retry mechanism in case of empty playlists

hola/flashls,mangui/flashls,aevange/flashls,Peer5/flashls,Boxie5/flashls,Boxie5/flashls,fixedmachine/flashls,thdtjsdn/flashls,jlacivita/flashls,dighan/flashls,dighan/flashls,mangui/flashls,codex-corp/flashls,tedconf/flashls,Corey600/flashls,neilrackett/flashls,fixedmachine/flashls,Peer5/flashls,JulianPena/flashls,vidible/vdb-flashls,aevange/flashls,jlacivita/flashls,hola/flashls,loungelogic/flashls,JulianPena/flashls,Corey600/flashls,loungelogic/flashls,vidible/vdb-flashls,NicolasSiver/flashls,Peer5/flashls,thdtjsdn/flashls,aevange/flashls,clappr/flashls,aevange/flashls,Peer5/flashls,NicolasSiver/flashls,neilrackett/flashls,codex-corp/flashls,tedconf/flashls,clappr/flashls