Fix a crash if the backend process doesn't set a Status header.
Fix a crash if the backend process doesn't set a Status header.

antek-drzewiecki/passenger,gravitystorm/passenger,kewaunited/passenger,bf4/passenger,openSUSE/passenger,erikogan/passenger,bf4/passenger,openSUSE/passenger,phusion/passenger,bf4/passenger,phusion/passenger,antek-drzewiecki/passenger,kewaunited/passenger,pkmiec/passenger,antek-drzewiecki/passenger,bf4/passenger,clemensg/passenger,gravitystorm/passenger,antek-drzewiecki/passenger,clemensg/passenger,cgvarela/passenger,jawj/passenger,clemensg/passenger,cgvarela/passenger,gravitystorm/passenger,kewaunited/passenger,antek-drzewiecki/passenger,openSUSE/passenger,fabiokung/passenger-debian,pkmiec/passenger,jawj/passenger,phusion/passenger,fabiokung/passenger-debian,openSUSE/passenger,jawj/passenger,clemensg/passenger,kewaunited/passenger,phusion/passenger,kewaunited/passenger,erikogan/passenger,clemensg/passenger,cgvarela/passenger,pkmiec/passenger,pkmiec/passenger,clemensg/passenger,kewaunited/passenger,cgvarela/passenger,jawj/passenger,cgvarela/passenger,kewaunited/passenger,gravitystorm/passenger,fabiokung/passenger-debian,phusion/passenger,cgvarela/passenger,antek-drzewiecki/passenger,phusion/passenger,antek-drzewiecki/passenger,gravitystorm/passenger,clemensg/passenger,cgvarela/passenger,jawj/passenger,jawj/passenger,gravitystorm/passenger,pkmiec/passenger,pkmiec/passenger,fabiokung/passenger-debian,pkmiec/passenger,openSUSE/passenger,erikogan/passenger,bf4/passenger,phusion/passenger,fabiokung/passenger-debian,antek-drzewiecki/passenger,erikogan/passenger,fabiokung/passenger-debian,clemensg/passenger,erikogan/passenger,jawj/passenger,cgvarela/passenger,bf4/passenger,bf4/passenger,phusion/passenger,erikogan/passenger,kewaunited/passenger,openSUSE/passenger