fix: prevent revert when deleting all script in script editor.

[fltLi]

fix: #562

原来的代码把空字符串误判为无效更改, 此处增加对空字符串的特判, 使其生效.

[gemini-code-assist]

Summary of Changes

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此拉取请求旨在解决脚本编辑器中一个关键的可用性问题。在之前的实现中，当用户清空脚本编辑器中的所有内容时，系统会错误地将空字符串判断为无效输入，从而导致编辑器的内容被意外地回滚到之前的状态。本次更改通过引入对空字符串的明确处理，确保了用户能够成功保存一个空的脚本文件，从而提升了编辑器的稳定性和用户体验。

Highlights

• 修复脚本编辑器中的空字符串处理: 解决了当用户在脚本编辑器中删除所有内容（导致空字符串）时，系统错误地将其视为无效更改并导致内容回滚的问题。通过增加对空字符串的特殊判断，确保其能被正确保存。

Changelog

• packages/origine2/src/pages/editor/TextEditor/TextEditor.tsx
  • 修复了当value为空字符串时，currentText.current不会被更新的问题。

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[gemini-code-assist]

Code Review

The pull request addresses a bug where deleting all script content in the editor was not recognized as a valid change, leading to unintended reverts. The fix correctly handles empty string values, ensuring that such changes are persisted. The change is minimal and directly targets the reported issue, improving the editor's robustness.