[Bug] `scan()` does not return a result (or null) nor throw an error.

[jifalops]

Describe the bug BarcodeScanner.scan() does not return a result, null, or throw an exception. The scanner Activity runs and exits after scanning a barcode, but no errors are logged.

To Reproduce Steps to reproduce the behavior:

• System is Ubuntu 18.04.
• I installed protobuf via pip install protobuf.
• Activated pub global activate protoc_plugin
• proto3 VS code plugin is installed.
• Is there another step to setup the system?

      try {
        final result = await BarcodeScanner.scan().catchError((e) {
          log.e('Barcode scan threw exception.', e);
        });
        log.v('Scan result: $result');
      } catch (e) {
        log.e('Barcode scan threw exception.', e);
      }

  Expected behavior Something should be logged.

Environment (please complete the following information):

• [ ] iOS? Version: ...
• [x] Android? Version: 29
• [X] Real Device? Pixel 4
• [ ] Emulator/Simulator? Which?: ...
• Version of barcode_scan: 3.0.1
• Output of flutter --version:

  Flutter 1.17.0 • channel stable • https://github.com/flutter/flutter.git
  Framework • revision e6b34c2b5c (5 weeks ago) • 2020-05-02 11:39:18 -0700
  Engine • revision 540786dd51
  Tools • Dart 2.8.1

[nilsreichardt]

Same issue!

[devtronic]

Pick one of them... https://github.com/mintware-de/flutter_barcode_reader/issues?q=is%3Aissue+is%3Aclosed+no+result

Upgrade Guide: https://github.com/mintware-de/flutter_barcode_reader/blob/master/UPGRADE.md#upgrade-from-2x-to-300