fix: openKeys should allow to be empty

[kerm1it]

fix ant-design/ant-design#28714

[codecov]

Codecov Report

Merging #360 (ba03268) into master (f65d352) will increase coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #360      +/-   ##
==========================================
+ Coverage   95.62%   95.73%   +0.10%     
==========================================
  Files          11       11              
  Lines         914      914              
  Branches      270      271       +1     
==========================================
+ Hits          874      875       +1     
+ Misses         40       39       -1     

Impacted Files	Coverage Δ
src/Menu.tsx	98.12% <100.00%> (ø)
src/util.ts	100.00% <0.00%> (+2.12%)	⬆️

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[kerm1it]

@afc163 发个 patch 版本。