SOLR-5231: Fixed a bug with the behavior of BoolField that caused documents w/o a value for the field to act as if the value were true in functions if no other documents in the same index segment had a value of true. (merge r1521948)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1521969 13f79535-47bb-0310-9956-ffa450edef68