John Crepezzi 4cac6713ef Fix memcached client fetch for key not found
The memcached client wasn't correctly handling looking up a key that
didn't exist.  Now we only try to push the expiration forward if there
is actually a value in memcached.

Also while I'm in here, allow expiration to be left blank.
2020-10-06 01:36:46 -04:00
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