Use unsetIsAnalyzed() in Analyzer.isTrueWithNullSlots() for implicit casting.

Change-Id: I99d6bf227c74c4967f5825626329c637a73e7b1a
Reviewed-on: http://gerrit.ent.cloudera.com:8080/1896
Reviewed-by: Alex Behm <alex.behm@cloudera.com>
Tested-by: jenkins