infobox: do not display variables from plugins if they don't exist
infobox: do not display variables from plugins if they don't exist

Debian/debsources,sophiejjj/debsources,matthieucan/debsources,Debian/debsources,vivekanand1101/debsources,zacchiro/debsources,vivekanand1101/debsources,matthieucan/debsources,zacchiro/debsources,devoxel/debsources,vivekanand1101/debsources,nonas/debian-qa,devoxel/debsources,nonas/debian-qa,sophiejjj/debsources,oorestisime/debsources,oorestisime/debsources,matthieucan/debsources,sophiejjj/debsources,zacchiro/debsources,vivekanand1101/debsources,devoxel/debsources,sophiejjj/debsources,clemux/debsources,Debian/debsources,devoxel/debsources,clemux/debsources,Debian/debsources,zacchiro/debsources,clemux/debsources,oorestisime/debsources,sophiejjj/debsources,Debian/debsources,oorestisime/debsources,zacchiro/debsources,matthieucan/debsources,oorestisime/debsources,clemux/debsources,nonas/debian-qa,clemux/debsources,devoxel/debsources,nonas/debian-qa,matthieucan/debsources,vivekanand1101/debsources