LUCENE-4776: also do not cache huge arrays for non-existent/unindexed: just return EMPTY

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1445897 13f79535-47bb-0310-9956-ffa450edef68
Merged /lucene/dev/trunk:r1445801-1445906

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene4765@1445909 13f79535-47bb-0310-9956-ffa450edef68
don't cache objects for non-existent/unindexed sortedset

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene4765@1445913 13f79535-47bb-0310-9956-ffa450edef68