It looks like all that's really needed on the scopes side is a
documentation update. I've documented a "art-fallback" in the
"components" dictionary of the category renderer. That allows a scope to
specify a category-specific fallback image. I think this should be
enough of a hook, but the shell will need to actually use the field if
it cannot retrieve the artwork for a particular result. If no fallback
image is specified, or the URI for the fallback image cannot be
resolved, I guess the shell should display some universal placeholder
image, so there is at least something on screen, instead of nothing at
all.

** Branch linked: lp:~michihenning/unity-scopes-api/fallback-image

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https://bugs.launchpad.net/bugs/1324142

Title:
  Support providing fallback images

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