Add loading for suspense.

Author: negative0

src/containers/DefaultLayout/DefaultLayout.js

@@ -53,7 +53,7 @@ class DefaultLayout extends Component {
                         <AppSidebar fixed display="lg">
                             <AppSidebarHeader/>
                             <AppSidebarForm/>
-                            <Suspense>
+                            <Suspense fallback={this.loading()}>
                                 <AppSidebarNav navConfig={navigation} {...this.props} />
                             </Suspense>
                             <AppSidebarFooter/>
@@ -104,4 +104,4 @@ const mapStateToProps = (state) => ({
     isConnected: state.status.isConnected,
 });
 
-export default connect(mapStateToProps, {})(DefaultLayout);
+export default connect(mapStateToProps, {})(DefaultLayout);