Discard stderr from "dpkg-query -W"
Discard stderr from "dpkg-query -W"

Avoids "No packages found matching" warning message.

HoMeCracKeR/0install,pombreda/0install,HoMeCracKeR/0install,bhilton/0install,timdiels/0install,timdiels/0install,afb/0install,0install/0install,gasche/0install,gasche/0install,bartbes/0install,gfxmonk/0install,bastianeicher/0install,timdiels/zeroinstall,dabrahams/0install,HoMeCracKeR/0install,gfxmonk/0install,dabrahams/0install,fdopen/0install,DarkGreising/0install,timdiels/zeroinstall,afb/0install,bartbes/0install,jaychoo/0install,DarkGreising/0install,timdiels/zeroinstall,michel-slm/0install,dabrahams/zeroinstall,afb/0install,gasche/0install,jaychoo/0install,dabrahams/0install,bhilton/0install,pombreda/0install,bastianeicher/0install,jaychoo/0install,dbenamy/0install,dabrahams/zeroinstall,michel-slm/0install,bhilton/0install,bastianeicher/0install,afb/0install,dbenamy/0install,fdopen/0install,timdiels/0install,DarkGreising/0install,pombreda/0install,dabrahams/zeroinstall,bartbes/0install,dbenamy/0install,michel-slm/0install,0install/0install,timdiels/0install,gasche/0install,fdopen/0install,gfxmonk/0install,0install/0install