try safe-guard before dispathEvent() calls

Author: etpinard

test/jasmine/assets/modebar_button.js

@@ -18,7 +18,7 @@ module.exports = function selectButton(modeBar, name) {
 
     button.click = function() {
         var ev = new window.MouseEvent('click');
-        node.dispatchEvent(ev);
+        if(node) node.dispatchEvent(ev);
     };
 
     button.isActive = function() {

test/jasmine/assets/mouse_event.js

@@ -45,7 +45,7 @@ module.exports = function(type, x, y, opts) {
         ev = new window.MouseEvent(type, fullOpts);
     }
 
-    el.dispatchEvent(ev);
+    if(el) el.dispatchEvent(ev);
 
     return el;
 };

test/jasmine/assets/touch_event.js

@@ -36,10 +36,9 @@ module.exports = function(type, x, y, opts) {
         fullOpts.shiftKey = opts.shiftKey;
     }
 
-
     ev = new window.TouchEvent(type, Lib.extendFlat({}, fullOpts, opts));
 
-    el.dispatchEvent(ev);
+    if(el) el.dispatchEvent(ev);
 
     return el;
 };

test/jasmine/tests/annotations_test.js

@@ -1547,7 +1547,9 @@ describe('annotation effects', function() {
 
                 setTimeout(function() {
                     var input = d3.select('.plugin-editable.editable');
-                    input.node().dispatchEvent(new KeyboardEvent('blur'));
+                    if(input.node()) {
+                        input.node().dispatchEvent(new KeyboardEvent('blur'));
+                    }
                 }, DBLCLICKDELAY * 1.1);
             });
         }