fix(Radio): child can contain null

Author: guanpu

src/radio/radio-group.jsx

@@ -155,6 +155,7 @@ class RadioGroup extends Component {
         let children;
         if (this.props.children) {
             children = React.Children.map(this.props.children, (child, index) => {
+                if (!React.isValidElement(child)) return child;
                 const checked = this.state.value === child.props.value;
                 const tabIndex = ((index === 0 && !this.state.value) || checked) ? 0 : -1;
                 return React.cloneElement(child, child.props.tabIndex === undefined ? {

test/radio/group-spec.js

@@ -342,6 +342,14 @@ describe('Radio.Group', () => {
             </RadioGroup>);
             assert(wrapper.find('.next-radio-button').children().length === 2);
         });
+        it('should support null children', () => {
+            const wrapper = mount(<RadioGroup dataSource={['apple', 'orange', 'pear']}>
+                {null}
+                <Radio tabIndex="0" key="2">Orange</Radio>
+                HelloWorld
+            </RadioGroup>);
+            assert(wrapper.find('label').length === 1);
+        });
     });
 
 });