Added more information to exception message when no member of the replica set have been found that match what was requested

Author: jyemin

src/main/com/mongodb/DBTCPConnector.java

@@ -440,10 +440,11 @@ DBPort get( boolean keep , ReadPreference readPref, ServerAddress hostNeeded ){
                 p = _masterPortPool.get();
             }
             else {
-                ConnectionStatus.Node node = readPref.getNode(getReplicaSetStatus()._replicaSetHolder.get());
+                ReplicaSetStatus.ReplicaSet replicaSet = getReplicaSetStatus()._replicaSetHolder.get();
+                ConnectionStatus.Node node = readPref.getNode(replicaSet);
 
                 if (node == null)
-                    throw new MongoException("No replica set members available for query with "+readPref.toDBObject().toString());
+                    throw new MongoException("No replica set members available in " +  replicaSet + " for " + readPref.toDBObject().toString());
 
                 p = _portHolder.get(node.getServerAddress()).get();
             }