Minor fixes in tools: (#11009)

* Include the process' `stdout` and `stderr` when it returns a
  non-zero exit code in `runCheckedAsync()`
* Defensively catch errors in `AndroidDevice.isAppInstalled()`
  and return false

packages/flutter_tools/lib/src/android/android_device.dart

@@ -243,8 +243,13 @@ class AndroidDevice extends Device {
   @override
   Future<bool> isAppInstalled(ApplicationPackage app) async {
     // This call takes 400ms - 600ms.
-    final RunResult listOut = await runCheckedAsync(adbCommandForDevice(<String>['shell', 'pm', 'list', 'packages', app.id]));
-    return LineSplitter.split(listOut.stdout).contains("package:${app.id}");
+    try {
+      final RunResult listOut = await runCheckedAsync(adbCommandForDevice(<String>['shell', 'pm', 'list', 'packages', app.id]));
+      return LineSplitter.split(listOut.stdout).contains('package:${app.id}');
+    } catch (error) {
+      printTrace('$error');
+      return false;
+    }
   }
 
   @override

packages/flutter_tools/lib/src/base/process.dart

@@ -211,7 +211,7 @@ Future<RunResult> runCheckedAsync(List<String> cmd, {
       environment: environment
   );
   if (result.exitCode != 0)
-    throw 'Exit code ${result.exitCode} from: ${cmd.join(' ')}';
+    throw 'Exit code ${result.exitCode} from: ${cmd.join(' ')}:\n$result';
   return result;
 }