Fix crash when the hook_spawn_failed hook is not set
Fix crash when the hook_spawn_failed hook is not set

antek-drzewiecki/passenger,clemensg/passenger,kewaunited/passenger,phusion/passenger,cgvarela/passenger,kewaunited/passenger,cgvarela/passenger,clemensg/passenger,phusion/passenger,cgvarela/passenger,phusion/passenger,antek-drzewiecki/passenger,clemensg/passenger,clemensg/passenger,cgvarela/passenger,phusion/passenger,antek-drzewiecki/passenger,antek-drzewiecki/passenger,antek-drzewiecki/passenger,kewaunited/passenger,cgvarela/passenger,phusion/passenger,antek-drzewiecki/passenger,phusion/passenger,phusion/passenger,phusion/passenger,cgvarela/passenger,clemensg/passenger,kewaunited/passenger,kewaunited/passenger,clemensg/passenger,kewaunited/passenger,antek-drzewiecki/passenger,clemensg/passenger,kewaunited/passenger,clemensg/passenger,cgvarela/passenger,antek-drzewiecki/passenger,kewaunited/passenger,cgvarela/passenger