The intention was that a scope can specify a specific fallback image.
That image should be shown when the normal image load returns an error
or an empty image (zero-length ByteArray, or whatever type it is).

This allows the scope to specify a specific fallback image that might be
needed to keep style/theming for the scope. If the scope doesn't provide
a fallback image, or loading of the specified fallback image fails, the
shell can substitute some generic fallback image.

That was the thinking at the time we added this feature.

What's the problem with doc? If it isn't right, I'll fix it.

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https://bugs.launchpad.net/bugs/1531913

Title:
  Fallback image not shown when no image specified

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