Merge pull request #147 from casparvl/fix_updates_at_zero_cpu

Fix update at zero cpu

Author: jtpio

jupyter_resource_usage/static/main.js

@@ -74,7 +74,7 @@ define([
 
                 // Handle CPU display
                 var cpuPercent = data['cpu_percent'];
-                if (cpuPercent) {
+                if (cpuPercent !== undefined) {
                     // Remove hide CSS class if the metrics API gives us a CPU percent to display
                     $('#jupyter-resource-usage-display-cpu').removeClass('jupyter-resource-usage-hide');
                     var maxCpu = data['cpu_count'];