修复缺少的| null类型 · Pull Request !72 · OpenHarmony-SIG/flutter_engine

*Replace this paragraph with a description of what this PR is changing or adding, and why. Consider including before/after screenshots.*

*List which issues are fixed by this PR. You must list at least one issue.*

*If you had to change anything in the [flutter/tests] repo, include a link to the migration guide as per the [breaking change policy].*

## Pre-launch Checklist

- [ ] I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
- [ ] I read the [Tree Hygiene] wiki page, which explains my responsibilities.
- [ ] I read and followed the [Flutter Style Guide] and the [C++, Objective-C, Java style guides].
- [ ] I listed at least one issue that this PR fixes in the description above.
- [ ] I added new tests to check the change I am making or feature I am adding, or Hixie said the PR is test-exempt. See [testing the engine] for instructions on writing and running engine tests.
- [ ] I updated/added relevant documentation (doc comments with `///`).
- [ ] I signed the [CLA].
- [ ] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel on [Discord].

[Contributor Guide]: https://github.com/flutter/flutter/wiki/Tree-hygiene#overview
[Tree Hygiene]: https://github.com/flutter/flutter/wiki/Tree-hygiene
[Flutter Style Guide]: https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo
[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
[testing the engine]: https://github.com/flutter/flutter/wiki/Testing-the-engine
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]: https://github.com/flutter/flutter/wiki/Tree-hygiene#handling-breaking-changes
[Discord]: https://github.com/flutter/flutter/wiki/Chat

类型	指派人员	状态
审查	zjzhu 已审查通过 aibin 已审查通过 lihui 已审查通过	已完成 (3/1人)
测试	openharmony_ci 已测试通过	已完成 (1/1人)

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