Changed vertex labeller so as to show no label when none is set

Author: rppc

GraphViewerController.jar

@@ -210,7 +210,7 @@ public String transform(Number v) {
 				String str = vertexLabels.get(v);
 				if (str != null)
 					return str;
-				else return v.toString();
+				else return "";
 			}
 		};
 		vv.getRenderContext().setVertexLabelTransformer(vertexesLabeler);