JavaScriptCollection
diff --git a/‎CONTRIBUTING.md‎
Lines changed: 4 additions & 3 deletions b/‎CONTRIBUTING.md‎
Lines changed: 4 additions & 3 deletions
diff --git a/‎src/popper.js‎
Lines changed: 2 additions & 2 deletions b/‎src/popper.js‎
Lines changed: 2 additions & 2 deletions
diff --git a/‎tests/test-popper.js‎
Lines changed: 12 additions & 1 deletion b/‎tests/test-popper.js‎
Lines changed: 12 additions & 1 deletion
@@ -11,14 +11,15 @@ Feature requests are welcome!
 
 ## Setup
 
-In order to properly work on the development environment, run:
+Make sure to have `grunt-cli` and `bower` installed globally.
+
+Then run:
 
 ```js
 npm install
+bower install
 ```
 
-and make sure to have `grunt-cli` and `bower` installed globally.
-
 ## Developing
 
 We develop following a test driven development approach.
 
@@ -139,9 +139,9 @@
 
         // if the popper variable is a configuration object, parse it to generate an HTMLElement
         // generate a default popper if is not defined
-        var isNotDefined = popper === undefined || popper === null;
+        var isNotDefined = typeof popper === 'undefined' || popper === null;
         var isConfig = popper && popper.constructor.name === 'Object';
-        if (  isNotDefined || isConfig) {
+        if (isNotDefined || isConfig) {
             this._popper = this.parse(isConfig ? popper : {});
         }
         // otherwise, use the given HTMLElement as popper
 
@@ -112,7 +112,7 @@ describe('Popper.js', function() {
         var relative = document.createElement('div');
         relative.style.position = 'relative';
         relative.style.margin = '20px';
-        relative.style.height = '200vh';
+        relative.style.height = '300vh';
         jasmineWrapper.appendChild(relative);
         document.body.scrollTop = 800;
 
@@ -234,4 +234,15 @@ describe('Popper.js', function() {
             done();
         });
     });
+
+    it('creates a popper when content is undefined', function(done) {
+        var reference = appendNewRef(1);
+
+        new TestPopper(reference).onCreate(function(instance) {
+            expect(instance._popper).toBeDefined();
+            expect(instance._popper.innerText).toBe('');
+            document.body.removeChild(instance._popper);
+            done();
+        });
+    });
 });