fix bug in collection filtering
fix bug in collection filtering

frlan/datenknoten.me,sylvestrelucia/grav,enko/datenknoten.me,TheHiddenHaku/alessiobottiroli-website-grav,getgrav/grav,jeremykenedy/grav,sylvestrelucia/grav,userfrosting/learn,undesign/undesign.github.io,Pumpapa/lucaswalters.nl,Vivalldi/grav,JamesPan/gravbox,tomzx/blog.tomrochette.com,Vivalldi/grav,enko/datenknoten.me,davistech/grav,sylvestrelucia/grav,Silwereth/grav,dimayakovlev/grav,toovy/grav,Pumpapa/chriswalters.nl,notklaatu/grav,mikkeschiren/sekvenser-grav,beacloudgenius/grav,jinxboy13/grav,enko/datenknoten.me,sylvestrelucia/grav,ccardinaux/grav-test,Pumpapa/jacinthawalters.nl,z3cka/grav,userfrosting/learn,shortsofia/testesitegrav.github.io,undesign/undesign.github.io,userfrosting/learn,tomzx/blog.tomrochette.com,VillainyStudios/grav,JamesPan/gravbox,Pumpapa/lucaswalters.nl,qbi/datenknoten.me,JamesPan/gravbox,frlan/datenknoten.me,stell/grav,Pumpapa/lucaswalters.nl,dimayakovlev/grav,qbi/datenknoten.me,frlan/datenknoten.me,jeffam/grav,webuxr/iamrs,userfrosting/learn,joeyhenricks/a-broke-vegan,tcsizmadia/grav,Sommerregen/grav,eivantsov/grav-blog-site,qbi/datenknoten.me,toovy/grav,DonLiborio/grav,tomzx/blog.tomrochette.com,gigago/grav,enko/datenknoten.me,nunull/grav,iMoonThailand/grav,attiks/grav,JamesPan/gravbox,chkir/grav,qbi/datenknoten.me,tomzx/blog.tomrochette.com,frlan/datenknoten.me,joeyhenricks/a-broke-vegan,getgrav/grav,lennerd/grav,notklaatu/grav