LUCENE-5450: NPE and Illegal Argument Exception in wrapped SpanMultiTerms with no matches

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_7@1578513 13f79535-47bb-0310-9956-ffa450edef68
Merged revision(s) 1575715 from lucene/dev/branches/branch_4x:
Merged revision(s) 1575714 from lucene/dev/trunk:
LUCENE-5511: "ant precommit" / "ant check-svn-working-copy" now work again with any working copy format (thanks to svnkit 1.8.4).

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_4_7@1578514 13f79535-47bb-0310-9956-ffa450edef68