Merge pull request #9 from cmcn/master

Don't rerender the chart if data is null

README.md

@@ -226,26 +226,3 @@ contentSecurityPolicy: {
   'font-src': "'self' *.gstatic.com *.googleapis.com",
 }
 ```
-
-## Development
-
-### Releases
-
-Ensure tests are passing, then:
-
-```sh
-# Update github pages demo
-ember github-pages:commit --message "Added some functionality"
-git push origin gh-pages
-
-# Go back to master branch
-checkout master
-
-# Release to NPM and Github
-ember release # If patch
-ember release --minor # If minor
-ember release --major # If major
-
-# Release on NPM
-npm publish
-```

addon/components/google-chart.js

@@ -56,7 +56,7 @@ export default Ember.Component.extend({
   rerenderChart: Ember.observer('data', function() {
     const chart = this.get('chart');
 
-    if (chart) {
+    if (chart && this.get('data')) {
       this._renderChart();
     }
   }),
@@ -89,8 +89,6 @@ export default Ember.Component.extend({
     const data = this.get('data');
     const mergedOptions = this.get('mergedOptions');
 
-    assert('You have not passed any data to the chart', data);
-
     this.renderChart(window.google, data, mergedOptions).then((chart) => {
       this.set('chart', chart);
       this.sendAction('chartDidRender', chart);