[flutter_tools] dont crash when looking for AS4.1 on windows with no LOCALAPPDATA (#77261)

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

@@ -346,7 +346,7 @@ class AndroidStudio implements Comparable<AndroidStudio> {
     }
 
     // 4.1 has a different location for AndroidStudio installs on Windows.
-    if (globals.platform.isWindows) {
+    if (globals.platform.isWindows && globals.platform.environment.containsKey('LOCALAPPDATA')) {
       final File homeDot = globals.fs.file(globals.fs.path.join(
         globals.platform.environment['LOCALAPPDATA'],
         'Google',

packages/flutter_tools/test/general.shard/android/android_studio_test.dart

@@ -288,6 +288,24 @@ void main() {
     ProcessManager: () => FakeProcessManager.any(),
   });
 
+  testUsingContext('Does not discover Android Studio 4.1 location on Windows if LOCALAPPDATA is null', () {
+    windowsFileSystem.file(r'C:\Users\Dash\AppData\Local\Google\AndroidStudio4.1\.home')
+      ..createSync(recursive: true)
+      ..writeAsStringSync(r'C:\Program Files\AndroidStudio');
+    windowsFileSystem
+      .directory(r'C:\Program Files\AndroidStudio')
+      .createSync(recursive: true);
+
+    expect(AndroidStudio.allInstalled(), isEmpty);
+  }, overrides: <Type, Generator>{
+    Platform: () => FakePlatform(
+      operatingSystem: 'windows',
+      environment: <String, String>{}, // Does not include LOCALAPPDATA
+    ),
+    FileSystem: () => windowsFileSystem,
+    ProcessManager: () => FakeProcessManager.any(),
+  });
+
   group('Installation detection on Linux', () {
     FileSystemUtils fsUtils;