make sure rake clobber_assets
and FileStore#clear work when cache dir doesn't exist
#579
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This was exposed by the test suite for sprockets-rails. See here for an example of a failure.
Depending on the order the tests ran, they would sometimes pass, sometimes fail. I added a workaround on sprockets-rails at rails/sprockets-rails@977cc5f but this fixes the underlying issue. After this or similar fix lands on sprockets, I will remove that workaround on sprockets-rails.