This avoids alot of misleading log-messages like "Removing FOO from cache"
if FOO was not in the cache and as such is not a removal candidate.
(Bitbake rev: de34a403e206867e09410ad4925c7b9cff04fee6)
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>