add error messages to the session flash if an upload fails
add error messages to the session flash if an upload fails

rarila/bolt,codesman/bolt,tekjava/bolt,joshuan/bolt,GawainLynch/bolt,pygillier/bolt,hannesl/bolt,electrolinux/bolt,bolt/bolt,xeddmc/bolt,nantunes/bolt,nikgo/bolt,Intendit/bolt,HonzaMikula/masivnipostele,pygillier/bolt,bywatersolutions/reports-site,rossriley/bolt,romulo1984/bolt,one988/cm,marcin-piela/bolt,Calinou/bolt,winiceo/bolt,nikgo/bolt,lenvanessen/bolt,cdowdy/bolt,joshuan/bolt,richardhinkamp/bolt,nantunes/bolt,kendoctor/bolt,richardhinkamp/bolt,nantunes/bolt,lenvanessen/bolt,one988/cm,nantunes/bolt,nikgo/bolt,Eiskis/bolt-base,Intendit/bolt,GDmac/bolt,rarila/bolt,skript-cc/bolt,pygillier/bolt,richardhinkamp/bolt,HonzaMikula/bolt,marcin-piela/bolt,tekjava/bolt,Eiskis/bolt-base,GDmac/bolt,xeddmc/bolt,richardhinkamp/bolt,skript-cc/bolt,Raistlfiren/bolt,HonzaMikula/bolt,one988/cm,Intendit/bolt,tekjava/bolt,one988/cm,GawainLynch/bolt,hannesl/bolt,winiceo/bolt,codesman/bolt,winiceo/bolt,joshuan/bolt,xeddmc/bolt,rossriley/bolt,romulo1984/bolt,marcin-piela/bolt,winiceo/bolt,rossriley/bolt,HonzaMikula/masivnipostele,CarsonF/bolt,Eiskis/bolt-base,bolt/bolt,kendoctor/bolt,hugin2005/bolt,GDmac/bolt,lenvanessen/bolt,CarsonF/bolt,joshuan/bolt,lenvanessen/bolt,GawainLynch/bolt,HonzaMikula/masivnipostele,skript-cc/bolt,nikgo/bolt,bywatersolutions/reports-site,hugin2005/bolt,bolt/bolt,codesman/bolt,marcin-piela/bolt,electrolinux/bolt,Raistlfiren/bolt,kendoctor/bolt,romulo1984/bolt,Raistlfiren/bolt,Calinou/bolt,CarsonF/bolt,electrolinux/bolt,cdowdy/bolt,hannesl/bolt,electrolinux/bolt,xeddmc/bolt,bywatersolutions/reports-site,codesman/bolt,romulo1984/bolt,tekjava/bolt,Calinou/bolt,GawainLynch/bolt,Raistlfiren/bolt,Eiskis/bolt-base,rarila/bolt,HonzaMikula/bolt,hugin2005/bolt,cdowdy/bolt,GDmac/bolt,Intendit/bolt,bywatersolutions/reports-site,CarsonF/bolt,pygillier/bolt,skript-cc/bolt,rarila/bolt,HonzaMikula/masivnipostele,cdowdy/bolt,kendoctor/bolt,hannesl/bolt,hugin2005/bolt,bolt/bolt,rossriley/bolt,Calinou/bolt,HonzaMikula/bolt