fix: #382 prevent network calls for the falsy/undefined src values inside isImageValid

[varunsharma27]

Issue: [Bug] A bunch of image requests to undefined

close #382

Summary by CodeRabbit

• Bug Fixes
  • 优化了图片加载的错误处理逻辑：当图片源为空或无效时，系统会立即返回失败，避免后续不必要的操作，从而提升整体稳定性和用户体验。

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[coderabbitai]

Walkthrough

在 src/util.ts 文件中的 isImageValid 函数增加了对 src 参数的检查。现在该函数会先判断传入的 src 是否为 falsy（如 null、undefined 或空字符串），如果是，则立即返回 false 并终止后续操作。这一修改提升了函数在处理无效图片路径时的健壮性。

Changes

文件	变更摘要
src/util.ts	在 isImageValid 函数中增加了对 src 参数的 falsy 检查，若无效则提前返回 false，防止无效图片加载。

Sequence Diagram(s)

sequenceDiagram
    participant C as 客户端
    participant F as isImageValid 函数

    C->>F: 调用 isImageValid(src)
    alt src 为 falsy
        F->>C: 返回 false (提前终止)
    else src 有效
        F->>F: 创建图片对象并加载 src
        F->>C: 返回加载结果
    end

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Poem

小兔敲键轻轻跳，
代码花开不等待；
若遇无效 src，
立刻退下不烦恼 🐰；
稳健逻辑伴梦远，
程序世界乐逍遥！

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src/util.ts

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[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (1)

src/util.ts (1)

3-6: 这个修改很好，可以避免不必要的网络请求！

新增的代码可以防止当src参数为falsy值（如null、undefined或空字符串）时进行不必要的网络调用，从而提高性能和稳定性。这正确地解决了PR中提到的问题。

不过，函数签名显示src参数期望类型为string，但实际上函数现在处理的是包括falsy值在内的情况。考虑更新函数签名以明确允许这些情况，例如：src: string | null | undefined。

- export function isImageValid(src: string) {
+ export function isImageValid(src: string | null | undefined) {

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📥 Commits

Reviewing files that changed from the base of the PR and between d4684be and f2e71da.

📒 Files selected for processing (1)

• src/util.ts (1 hunks)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.40%. Comparing base (d4684be) to head (f2e71da).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #383   +/-   ##
=======================================
  Coverage   99.39%   99.40%           
=======================================
  Files          17       17           
  Lines         499      502    +3     
  Branches      147      148    +1     
=======================================
+ Hits          496      499    +3     
  Misses          3        3           

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