Path getter can return null

[zegnus]

Describe the bug
The PlatformFile object can be instantiated with a null path:

class PlatformFile {
  PlatformFile({
    String? path,
    required this.name,
    required this.size,
    this.bytes,
    this.readStream,
  }) : _path = path;

But the public method String get path does not allow to return null:

String get path {
    if (kIsWeb) {
      /// https://github.com/miguelpruivo/flutter_file_picker/issues/751
      throw '''
      On web `path` is always `null`,
      You should access `bytes` property instead,
      Read more about it [here](https://github.com/miguelpruivo/flutter_file_picker/wiki/FAQ)
      ''';
    }
    return _path!;
  }

where

    return _path!;

will throw an error

Platform

• Android
• iOS
• Web
• Desktop (Go)

Platform OS version
This is platform-independent error

Details to reproduce the issue

1. Instantiate a PlatformFile without providing a path
2. Access the path

[miguelpruivo]

Hi, thank you, good catch.

[miguelpruivo]

Fixed with 4.0.3.