Fix single graph bug in chart.js2, a=chris

diff --git a/src/scripts/chart.js b/src/scripts/chart.js
index fe006c72a..6d8548ff7 100644
--- a/src/scripts/chart.js
+++ b/src/scripts/chart.js
@@ -199,7 +199,7 @@ function Chart(chart_id, data)
         }
         var num_graphs = 1;
         if (data.num_graphs === 'undefined') {
-            graph_data = data;
+            graph_data = [data];
         } else {
             graph_data = data.graphs;
             num_graphs = data.num_graphs;
@@ -238,7 +238,7 @@ function Chart(chart_id, data)
         self.renderAxes();
         num_graphs = 1;
         if (data.num_graphs === 'undefined') {
-            graph_data = data;
+            graph_data = [data];
         } else {
             graph_data = data.graphs;
             num_graphs = data.num_graphs;