Fixed a case where topology info was incorrectly being set (#108)

Author: connelly38

driver/src/main/java/oracle/nosql/driver/ops/serde/nson/NsonSerializerFactory.java

@@ -2670,7 +2670,7 @@ static void readTopologyInfo(ByteInputStream in,
                                              Result result)
             throws IOException {
 
-            int proxyTopoSeqNum = 1;
+            int proxyTopoSeqNum = -1;
             int[] shardIds = null;
             MapWalker walker = new MapWalker(in);
 

driver/src/main/java/oracle/nosql/driver/query/TopologyInfo.java

@@ -16,6 +16,9 @@ public class TopologyInfo {
     private int[] theShardIds;
 
     public TopologyInfo(int seqNum, int[] shardIds) {
+        if (shardIds == null) {
+            throw new IllegalArgumentException("TopologyInfo shardIds must not be null");
+        }
         theSeqNum = seqNum;
         theShardIds = shardIds;
     }