Fix check error: labs is undefined

close ant-design/ant-design#7312

Author: afc163

src/Select.jsx

@@ -743,9 +743,9 @@ class Select extends Component {
         this._cacheTreeNodesStates = false;
         this.setState({
           value: this.getValue(props, toArray(this._savedValue).map((v, i) => {
-            return {
+            return this.isLabelInValue() ? v : {
               value: v,
-              label: labs[i],
+              label: labs && labs[i],
             };
           })),
         });

tests/Select.checkable.spec.js

@@ -53,4 +53,35 @@ describe('TreeSelect.checkable', () => {
     wrapper.find('.rc-tree-select-selection__clear').simulate('click');
     expect(wrapper.find('.rc-tree-select-selection__choice')).toHaveLength(0);
   });
+
+  // Fix https://github.com/ant-design/ant-design/issues/7312#issuecomment-324865971
+  it('should be checkable when treeCheckStrictly is true', () => {
+    const treeData = [
+      {label: '1-1', value: '1-1', children: []},
+      {label: '1-2', value: '1-2', children: []},
+      {label: '1-3', value: '1-3', children: [
+        {label: '2-1', value: '2-1', children: []},
+        {label: '2-2', value: '2-2', children: []},
+      ]},
+    ];
+    const handleChange = jest.fn();
+    const wrapper = mount(
+      <TreeSelect
+        treeData={treeData}
+        treeCheckable
+        treeCheckStrictly
+        multiple
+        onChange={handleChange}
+      />
+    );
+    // open
+    jest.useFakeTimers();
+    wrapper.find('.rc-tree-select').simulate('click');
+    jest.runAllTimers();
+    // select
+    wrapper.find('.rc-tree-select-tree-checkbox').at(0).simulate('click');
+    expect(handleChange).toBeCalled();
+    expect(wrapper.find('.rc-tree-select-selection__choice__content').length).toBe(1);
+    expect(wrapper.find('.rc-tree-select-selection__choice__content').at(0).text()).toBe('1-1');
+  });
 });