Don't check valid media list if its' in whitelist
Don't check valid media list if its' in whitelist

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