don't send crash reports if on a user branch (#33078)

* don't send crash reports if on a user branch.
* add test to test/crash_reporting_test.dart

packages/flutter_tools/lib/runner.dart

@@ -60,7 +60,7 @@ Future<int> run(
       await runner.run(args);
       await _exit(0);
     } catch (error, stackTrace) {
-      String getVersion() => flutterVersion ?? FlutterVersion.instance.getVersionString();
+      String getVersion() => flutterVersion ?? FlutterVersion.instance.getVersionString(redactUnknownBranches: true);
       return await _handleToolError(error, stackTrace, verbose, args, reportCrashes, getVersion);
     }
     return 0;

packages/flutter_tools/lib/src/crash_reporting.dart

@@ -86,12 +86,15 @@ class CrashReportSender {
     @required String getFlutterVersion(),
   }) async {
     try {
-      if (_usage.suppressAnalytics)
+      final String flutterVersion = getFlutterVersion();
+
+      // We don't need to report exceptions happening on user branches
+      if (_usage.suppressAnalytics || RegExp(r'^\[user-branch\]\/').hasMatch(flutterVersion)) {
         return;
+      }
 
       printStatus('Sending crash report to Google.');
 
-      final String flutterVersion = getFlutterVersion();
       final Uri uri = _baseUrl.replace(
         queryParameters: <String, String>{
           'product': _kProductId,

packages/flutter_tools/test/crash_reporting_test.dart

@@ -123,6 +123,39 @@ void main() {
       Stdio: () => const _NoStderr(),
     });
 
+    testUsingContext('should not send a crash report if on a user-branch', () async {
+      String method;
+      Uri uri;
+
+      CrashReportSender.initializeWith(MockClient((Request request) async {
+        method = request.method;
+        uri = request.url;
+
+        return Response(
+          'test-report-id',
+          200,
+        );
+      }));
+
+      final int exitCode = await tools.run(
+        <String>['crash'],
+        <FlutterCommand>[_CrashCommand()],
+        reportCrashes: true,
+        flutterVersion: '[user-branch]/v1.2.3',
+      );
+
+      expect(exitCode, 1);
+
+      // Verify that the report wasn't sent
+      expect(method, null);
+      expect(uri, null);
+
+      final BufferLogger logger = context.get<Logger>();
+      expect(logger.statusText, '');
+    }, overrides: <Type, Generator>{
+      Stdio: () => const _NoStderr(),
+    });
+
     testUsingContext('can override base URL', () async {
       Uri uri;
       CrashReportSender.initializeWith(MockClient((Request request) async {