fix for empty media attributes on assets
fix for empty media attributes on assets

JamesPan/gravbox,beacloudgenius/grav,joeyhenricks/a-broke-vegan,TheHiddenHaku/alessiobottiroli-website-grav,tomzx/blog.tomrochette.com,undesign/undesign.github.io,sylvestrelucia/grav,userfrosting/learn,tomzx/blog.tomrochette.com,sylvestrelucia/grav,tcsizmadia/grav,tomzx/blog.tomrochette.com,Pumpapa/lucaswalters.nl,userfrosting/learn,Pumpapa/lucaswalters.nl,ccardinaux/grav-test,toovy/grav,undesign/undesign.github.io,shortsofia/testesitegrav.github.io,Vivalldi/grav,getgrav/grav,JamesPan/gravbox,tomzx/blog.tomrochette.com,notklaatu/grav,webuxr/iamrs,joeyhenricks/a-broke-vegan,notklaatu/grav,stell/grav,Pumpapa/lucaswalters.nl,sylvestrelucia/grav,Pumpapa/chriswalters.nl,JamesPan/gravbox,dimayakovlev/grav,lennerd/grav,iMoonThailand/grav,Pumpapa/jacinthawalters.nl,sylvestrelucia/grav,Vivalldi/grav,getgrav/grav,toovy/grav,userfrosting/learn,userfrosting/learn,JamesPan/gravbox,Sommerregen/grav,gigago/grav,dimayakovlev/grav,Silwereth/grav