Prevent NaN in updatePosition

src/rich_text_editor/index.js

@@ -280,9 +280,8 @@ export default () => {
         event: 'rteToolbarPosUpdate',
         left: 0
       });
-
-      style.top = pos.top + un;
-      style.left = pos.left + un;
+      style.top = (pos.top || 0) + un;
+      style.left = (pos.left || 0) + un;
     },
 
     /**

test/specs/css_composer/model/CssModels.js

@@ -49,6 +49,7 @@ describe('CssRule', () => {
     var s2 = obj.get('selectors').add({ name: 'test2' });
     obj.set('state', 'hover');
     obj.set('mediaText', '1000');
+    obj.set('atRuleType', 'media');
     expect(obj.compare([s1, s2])).toEqual(false);
     expect(obj.compare([s1, s2], 'hover')).toEqual(false);
     expect(obj.compare([s2, s1], 'hover', '1000')).toEqual(true);