Adding empty image for sponsor with no logo

[beta-ziliani]

Replaces #795

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[straight-shoota]

I believe it would be easier to assign the empty logo in the sponsor data. We should be able to do that by putting a metching entry with logo in _data/others.json.
This would avoid introducing more complexity into the template. This can be handled on the data side, so it's best to do it there.

Also this particular SVG is certainly not approvable.
I would consider keeping it completely blank maybe?

[beta-ziliani]

Done that, although the merge system is not great for this. We should implement a better strategy in the future; one that doesn't require so many fields when just needing to override one.

[straight-shoota]

@beta-ziliani I understand partial merge should work with overrides property... I believe it did in the past. But might need to look into. We can merge this of course.