From 07393fcc9279aac9492f1a8e528cae2cced7bb44 Mon Sep 17 00:00:00 2001
From: Struan Donald <struan@exo.org.uk>
Date: Wed, 29 Aug 2018 14:42:28 +0100
Subject: do not generate labels for empty dashboard graphs

Avoid a JS error if a line graph has no points. This is mostly useful
for collideoscope where we only want to show one line.
---
 web/js/dashboard.js | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'web/js/dashboard.js')

diff --git a/web/js/dashboard.js b/web/js/dashboard.js
index 82b5e6188..318e64c76 100644
--- a/web/js/dashboard.js
+++ b/web/js/dashboard.js
@@ -30,6 +30,9 @@ $(function(){
 
         var lasty = 0;
         $.each(chart.config.data.datasets, function(datasetIndex, dataset){
+            if (dataset.data.length == 0) {
+                return;
+            }
             var $label = $('.label[data-datasetIndex="' + datasetIndex + '"]', $parent);
             var latestPoint = chart.getDatasetMeta(datasetIndex).data[ dataset.data.length - 1 ];
             var y = latestPoint._model.y;
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