Don't print unparseable values in config interface forms.
Don't print unparseable values in config interface forms.

darcs-hash:20050928180728-4cc09-fbb149047e2465d89b245166e6826a97daa0c934.gz

nxtreaming/chumen,fukusaka/polipo,fqtools/polipo,nxtreaming/chumen,jeromelebel/polipo,Android-Apps/polipo,akkakks/polipo,galeksandrp/polipo,feijilei/polipo,jech/polipo,dxq-git/polipo,dxq-git/polipo,berkley4/polipo,galeksandrp/polipo,nxtreaming/chumen,berkley4/polipo,lkraider/polipo,clowwindy/polipo,feijilei/polipo,jech/polipo,jech/polipo,Android-Apps/polipo,ssb22/polipo2,Psiphon-Inc/polipo,strongwillow/polipo,akkakks/polipo,lkraider/polipo,fqtools/polipo,strongwillow/polipo,caeies/polipo-caeies,ajmgh/polipo,ssb22/polipo2,danchr/polipo,gorakhargosh/polipo,toke/polipo,doublec/namecoin-polipo,ssb22/polipo2,feijilei/polipo,lkraider/polipo,galeksandrp/polipo,berkley4/polipo,fqtools/polipo,TierraDelFuego/opilop,akkakks/polipo,dxq-git/polipo