HTTPCLIENT-1299: (regression) cache incorrectly disposes of the underlying cache resource when storing variant entry (follow-up)
Contributed by James Leigh <james at 3roundstones.com>

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/branches/4.2.x@1468824 13f79535-47bb-0310-9956-ffa450edef68