Catch errors when querying physical devices

Summary:
This is our #1 error and always means there's something off with
the user's setup.

Reviewed By: mweststrate

Differential Revision: D26370974

fbshipit-source-id: 5e2644ce9de8a7d28614a22fab5ce54dab0561d3

desktop/app/src/utils/iOSContainerUtility.tsx

@@ -64,7 +64,8 @@ async function targets(idbPath: string): Promise<Array<DeviceTarget>> {
   // But idb is MUCH more CPU efficient than instruments, so
   // when installed, use it.
   if (await memoize(isAvailable)(idbPath)) {
-    return safeExec(`${idbPath} list-targets --json`).then(({stdout}) =>
+    return safeExec(`${idbPath} list-targets --json`)
+      .then(({stdout}) =>
         // It is safe to assume this to be non-null as it only turns null
         // if the output redirection is misconfigured:
         // https://stackoverflow.com/questions/27786228/node-child-process-spawn-stdout-returning-as-null
@@ -76,13 +77,18 @@ async function targets(idbPath: string): Promise<Array<DeviceTarget>> {
           .filter(Boolean)
           .map((line) => JSON.parse(line))
           .filter(({type}: IdbTarget) => type !== 'simulator')
-        .map((target: IdbTarget) => {
+          .map<DeviceTarget>((target: IdbTarget) => {
             return {udid: target.udid, type: 'physical', name: target.name};
           }),
-    );
+      )
+      .catch((e: Error) => {
+        console.warn('Failed to query idb for targets:', e);
+        return [];
+      });
   } else {
     await killOrphanedInstrumentsProcesses();
-    return safeExec('instruments -s devices').then(({stdout}) =>
+    return safeExec('instruments -s devices')
+      .then(({stdout}) =>
         stdout!
           .toString()
           .split('\n')
@@ -91,10 +97,14 @@ async function targets(idbPath: string): Promise<Array<DeviceTarget>> {
           .map((line) => /(.+) \([^(]+\) \[(.*)\]( \(Simulator\))?/.exec(line))
           .filter(notNull)
           .filter(([_match, _name, _udid, isSim]) => !isSim)
-        .map(([_match, name, udid]) => {
-          return {udid: udid, type: 'physical', name: name};
+          .map<DeviceTarget>(([_match, name, udid]) => {
+            return {udid, type: 'physical', name};
           }),
-    );
+      )
+      .catch((e) => {
+        console.warn('Failed to query instruments:', e);
+        return [];
+      });
   }
 }