fix: prevent page broken via folderTree

[mortalYoung]

简介

• 优化 helper 代码，防止由于相同 id 导致寻找树节点失败，进而导致页面崩溃的问题

主要变更

• 添加非空判断

Related Issues

Closed #357

[codecov]

Codecov Report

Merging #358 (625219a) into main (9dd5e4a) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #358   +/-   ##
=======================================
  Coverage   58.38%   58.38%           
=======================================
  Files         173      173           
  Lines        4655     4655           
  Branches     1023     1024    +1     
=======================================
  Hits         2718     2718           
  Misses       1916     1916           
  Partials       21       21           

Impacted Files	Coverage Δ
src/services/helper.ts	87.30% <100.00%> (ø)

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[wewoor]

+1