Don't leave rejection unhandled if node fetching fails

Summary: Fix potentially unhandled promise rejection in Layout inspector. Not really reproducible, and probably originating from old Flipper versions (no trace is available either), since we have a lot of connection check in place. Just in case still handled the exception, for example if something goes wrong on client side

Reviewed By: passy

Differential Revision: D31267465

fbshipit-source-id: d1b384db7bb010af8d2aa12ae29110f343fb14af

desktop/plugins/public/layout/Inspector.tsx

@@ -312,11 +312,15 @@ export default class Inspector extends Component<Props, State> {
   ): Promise<Array<Element>> {
     if (ids.length > 0 && this.props.client.isConnected) {
       const {forAccessibilityEvent} = options;
-      const {elements}: {elements: Array<Element>} =
-        await this.props.client.call(this.call().GET_NODES, {
+      const {elements}: {elements: Array<Element>} = await this.props.client
+        .call(this.call().GET_NODES, {
           ids,
           forAccessibilityEvent,
           selected: false,
+        })
+        .catch((e) => {
+          console.error(`[Layout] Failed to fetch nodes from app:`, e);
+          return {elements: []};
         });
       if (!elements) {
         return [];