Fix bug where outputs of outputs wouldn't get deleted #3879
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Fixes #3875
This turned out to be a tricky one to track down, basically we wouldn't even attempt to re-run any asset whose primary inputs didn't exist - but we might actually need to re-run them just to reset their state to deleted.
Updated the
_runForInput
function to work when the primary input does not exist, and just skip the actual build step.This could probably be refactored to avoid a bunch of the unnecessary work in
_runForInput
, and just more eagerly delete all the transitive primary outputs once we decide to not output a file, but this seemed like the easiest fix for now.