Fix default selection cell/sharing button render functions in WBProcessListing.

frontend/src/js/component/wb-process-listing.js

@@ -115,11 +115,13 @@ class WBProcessListing extends Component {
 }
 
 WBProcessListing.defaultProps = {
-  'itemsPerPage': 100,
-  'ownerUuid': null,
-  'requestingContainerUuid': null,
-  'renderRenameLink': () => {},
-  'renderDeleteButton': () => {}
+  itemsPerPage: 100,
+  ownerUuid: null,
+  requestingContainerUuid: null,
+  renderRenameLink: () => null,
+  renderDeleteButton: () => null,
+  renderSelectionCell: () => null,
+  renderSharingButton: () => null
 };
 
 export default WBProcessListing;