feat(hierarchicalMenu): implement canRefine (#4685)

DX-1305

Author: Haroenv

src/connectors/hierarchical-menu/__tests__/connectHierarchicalMenu-test.js

@@ -472,6 +472,7 @@ See documentation: https://www.algolia.com/doc/api-reference/widgets/hierarchica
         category: {
           items: [],
           refine: expect.any(Function),
+          canRefine: false,
           createURL: expect.any(Function),
           sendEvent: expect.any(Function),
           widgetParams: { attributes: ['category', 'subCategory'] },
@@ -543,6 +544,7 @@ See documentation: https://www.algolia.com/doc/api-reference/widgets/hierarchica
           },
         ],
         refine: expect.any(Function),
+        canRefine: true,
         createURL: expect.any(Function),
         sendEvent: expect.any(Function),
         widgetParams: { attributes: ['category', 'subCategory'] },
@@ -580,6 +582,7 @@ See documentation: https://www.algolia.com/doc/api-reference/widgets/hierarchica
       ).toEqual({
         items: [],
         refine: expect.any(Function),
+        canRefine: false,
         sendEvent: expect.any(Function),
         createURL: expect.any(Function),
         widgetParams: { attributes: ['category', 'subCategory'] },
@@ -649,6 +652,7 @@ See documentation: https://www.algolia.com/doc/api-reference/widgets/hierarchica
           },
         ],
         refine: expect.any(Function),
+        canRefine: true,
         sendEvent: expect.any(Function),
         createURL: expect.any(Function),
         widgetParams: { attributes: ['category', 'subCategory'] },

src/connectors/hierarchical-menu/connectHierarchicalMenu.js

@@ -236,6 +236,7 @@ export default function connectHierarchicalMenu(renderFn, unmountFn = noop) {
         return {
           items,
           refine: this._refine,
+          canRefine: items.length > 0,
           createURL: _createURL,
           sendEvent,
           widgetParams,