COMPASS-387: Handle no global lock data (#681)

* COMPASS-387: Handle no global lock data

* COMPASS-387: Adding read/write graph tests

Author: durran

src/internal-packages/server-stats/lib/d3/stats-chart.js

@@ -319,9 +319,10 @@ const graphfunction = function() {
         .append('text')
         .attr('class', 'legend-linename')
         .attr('transform', 'translate(' + 13 + ',' + 9 + ')')
-        .text(function(d, i) {return data.labels.keys[i]; });
+        .text(function(d, i) { return data.labels.keys[i]; });
       legendDiv
         .append('text')
+        .attr('data-test-id', function(d) { return `performance-${d}`; })
         .attr('class', function(d) { return 'legend-count text-' + d;} )
         .attr('transform', 'translate(' + 15 + ',22)');
 

src/internal-packages/server-stats/lib/store/globallock-store.jsx

@@ -43,6 +43,9 @@ const GlobalLockStore = Reflux.createStore({
   },
 
   globalLock: function(error, doc, isPaused) {
+    if (!doc.globalLock) {
+      error = new Error('no global lock information returned from the serverstatus command');
+    }
     if (!error && doc) {
       if (this.starting) {
         this.starting = false;