Merge pull request #266 from Scra3/fix-empty-target

fix: when exceptSelector is defined and e.target is empty an error is thrown from closest function

ember-click-outside/src/modifiers/on-click-outside.js

@@ -88,7 +88,7 @@ export default class ClickOutsideModifier extends Modifier {
 
   _createHandler(element, action, exceptSelector) {
     return (e) => {
-      if (exceptSelector && closest(e.target, exceptSelector)) {
+      if (exceptSelector && e.target && closest(e.target, exceptSelector)) {
         return;
       }