Improve UI when no devices connected

Summary: Remove empty dropdown when no devices connected. Show 'No devices available' test instead.

Reviewed By: passy

Differential Revision: D31088007

fbshipit-source-id: 8a3bf0e8fbff04c7dfe2581f95576b3ab5ed4bcb

desktop/app/src/sandy-chrome/appinspect/AppSelector.tsx

@@ -85,6 +85,7 @@ export function AppSelector() {
 
   return (
     <>
+      {entries.length ? (
         <Radio.Group
           value={selectedApp}
           size="small"
@@ -111,6 +112,9 @@ export function AppSelector() {
             </AppInspectButton>
           </Dropdown>
         </Radio.Group>
+      ) : (
+        <Text>{'No devices available'}</Text>
+      )}
       <TroubleshootingGuide
         showGuide={GK.get('flipper_self_sufficiency')}
         devicesDetected={entries.length}