Unloaded emmissive maps should be black, not grey

[canny]

All textures, when they haven't loaded yet, default to grey. For the emmissive channel of PBR, a grey texture means the whole object glows quite brightly. Normally, emmisive textures are mostly black. So, when a pbr emmissive texture is present but not downloaded, the viewer should replace it with a solid black texture

https://secondlife.canny.io/admin/feedback/bug-reports/p/unloaded-emmissive-maps-should-be-black-not-grey

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[canny]

This issue has been linked to a Canny post: Unloaded emmissive maps should be black, not grey 🎉