fix: not found after no router set.

[czy88840616]

Checklist

• npm test passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

Description of change

[gitpod-io]

[codecov-commenter]

Codecov Report

Merging #1698 (27cc7ae) into main (c17f049) will increase coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1698      +/-   ##
==========================================
+ Coverage   82.05%   82.15%   +0.10%     
==========================================
  Files         388      388              
  Lines       12836    12883      +47     
  Branches     2973     2979       +6     
==========================================
+ Hits        10532    10584      +52     
+ Misses       2112     2107       -5     
  Partials      192      192              

Impacted Files	Coverage Δ
packages/web-express/src/framework.ts	78.70% <100.00%> (ø)
packages/web-koa/src/framework.ts	72.16% <100.00%> (ø)
packages/web-koa/src/onerror.ts	54.63% <100.00%> (ø)
packages/web/src/framework/web.ts	82.51% <100.00%> (ø)
packages/task/src/configuration.ts	100.00% <0.00%> (ø)
packages/task/src/framework.ts	93.75% <0.00%> (+7.21%)	⬆️

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