LUCENE-4856: If there are no matches for a given field, return the first maxPassages sentences

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1458867 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-4856: revert ... need to add option to Solr

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1458870 13f79535-47bb-0310-9956-ffa450edef68