defaultMapImageUrl - check for signed URLs

[marekhvolka]

Please, can we add a check to the defaultMapImageUrl for the signed URLs? So when we have a signed URL for a specific block, we will use it instead of the native URL. This was the only reason I had to override the mapImageUrl method and I guess, it would be better to have this built-in (it took some time to figure it out as well)

Something like:

if (data.signed_urls && data.signed_urls[block.id]) {
  return data.signed_urls[block.id];
}

[transitive-bullshit]

This is a great idea. Good catch.