HBASE-9524 Multi row get does not return any results even if any one of the rows specified in the query is missing and improve exception handling (Vandana Ayyalasomayajula)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.96@1552371 13f79535-47bb-0310-9956-ffa450edef68