From b9550a02668a1583223d4b9042e2ef4006e2d906 Mon Sep 17 00:00:00 2001
From: Dan Doyle <daldoyle@netsage-portal-pennren.grnoc.iu.edu>
Date: Thu, 14 Nov 2019 19:59:15 +0000
Subject: [PATCH] adding bail out for empty sankey graph

---
 src/netsage_sankey.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/netsage_sankey.js b/src/netsage_sankey.js
index 8f2f803..ac7ed06 100644
--- a/src/netsage_sankey.js
+++ b/src/netsage_sankey.js
@@ -422,7 +422,7 @@ export class NetSageSankey extends MetricsPanelCtrl {
 
         // get sankey graph from data
         var graph = ctrl.createSankeyGraphFromData(sankeyData);
-
+		
         //render sankey
         ctrl.renderSankey(graph);
     }
@@ -477,6 +477,11 @@ export class NetSageSankey extends MetricsPanelCtrl {
 
     // make sankey chart
     renderSankey(graph) {
+
+	if (graph.links.length == 0 || graph.nodes.length == 0){
+	    return;
+	}
+
         var ctrl = this;
         d3.select('#' + ctrl.containerDivId).selectAll('g').remove();