Implemented noRowsMessage method to UiRefTableViewMessageHandler.

Change-Id: I73a5ad8bce1668336ede05433cc9c57d9a572049
diff --git a/uiref/src/main/java/org/onosproject/uiref/UiRefTableViewMessageHandler.java b/uiref/src/main/java/org/onosproject/uiref/UiRefTableViewMessageHandler.java
index 4cf6ace..a4f33d1 100644
--- a/uiref/src/main/java/org/onosproject/uiref/UiRefTableViewMessageHandler.java
+++ b/uiref/src/main/java/org/onosproject/uiref/UiRefTableViewMessageHandler.java
@@ -64,6 +64,8 @@
     // handler for table view data requests
     private final class UiRefTableDataRequestHandler extends TableRequestHandler {
 
+        private static final String NO_ROWS_MESSAGE = "No items found";
+
         private UiRefTableDataRequestHandler() {
             super(UI_REF_TABLE_DATA_REQ, UI_REF_TABLE_DATA_RESP, UI_REF_TABLES);
         }
@@ -75,6 +77,11 @@
             return COLUMN_IDS;
         }
 
+        @Override
+        protected String noRowsMessage(ObjectNode payload) {
+            return NO_ROWS_MESSAGE;
+        }
+
         // if required, override createTableModel() to set
         // column formatters / comparators