fix(avatarcrppoer): cannot read property 'createImage' of null

[Alex-huxiyang]

这个 PR 做了什么? (简要描述所做更改)

这个 PR 是什么类型? (至少选择一个)

• feat: 新特性提交
• fix: bug 修复
• docs: 文档改进
• style: 组件样式/交互改进
• type: 类型定义更新
• perf: 性能、包体积优化
• refactor: 代码重构、代码风格优化
• test: 测试用例
• chore(deps): 依赖升级
• chore(demo): 演示代码改进
• chore(locale): 国际化改进
• chore: 其他改动（是关于什么的改动？）

这个 PR 涉及以下平台:

• NutUI H5 @nutui/nutui
• NutUI Taro @nutui/nutui-taro

这个 PR 是否已自测:

• 自测 Vite 脚手架使用 测试仓库
• 自测 Taro 脚手架使用小程序 & Taro-H5 测试仓库

Summary by CodeRabbit

• Bug Fixes
  • 增强了错误处理，确保在提供无效画布时立即拒绝返回的 Promise，从而改善了函数的可靠性。

[coderabbitai]

Walkthrough

此次更改在 dataURLToCanvasImage 函数中引入了一个验证检查，以确保 canvas 参数不为空或未定义。如果 canvas 无效，函数将立即拒绝返回的 Promise，并提供相应的错误信息。这一增强的错误处理机制提升了代码的稳健性，确保在处理无效画布时不再执行后续逻辑。

Changes

文件路径	更改摘要
src/packages/__VUE/avatarcropper/index.taro.vue	在 dataURLToCanvasImage 函数中添加了对 canvas 参数的验证检查，改善了错误处理。

Poem

在画布上跳跃，光影飞舞，
小兔子欢笑，守护每一步。
若有错漏，将早早退场，
代码如春风，温暖又畅快。 🌼🐰✨

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[coderabbitai]

Actionable comments posted: 0

Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between a4e64ee and 4715f19.

Files selected for processing (1)

• src/packages/__VUE/avatarcropper/index.taro.vue (1 hunks)

Additional comments not posted (1)

src/packages/__VUE/avatarcropper/index.taro.vue (1)

248-250: 改进错误处理：添加对空 canvas 的检查。

在 dataURLToCanvasImage 函数中添加了对 canvas 是否为空的检查。这是一个很好的实践，可以防止在 canvas 为空时继续执行导致的运行时错误。建议确保错误消息与代码库中的其他错误消息保持一致。

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.18%. Comparing base (a4e64ee) to head (86711fd).

Additional details and impacted files

@@           Coverage Diff           @@
##               v4    #3167   +/-   ##
=======================================
  Coverage   81.18%   81.18%           
=======================================
  Files         226      226           
  Lines       18142    18142           
  Branches     2485     2485           
=======================================
  Hits        14729    14729           
  Misses       3395     3395           
  Partials       18       18           

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