css key missing from manifest if cssCodeSplit is set to false

[spaceemotion]

Describe the bug

If build.cssCodeSplit is set to false, the manifest does not list any information about CSS-output for each entry.

Reproduction

https://stackblitz.com/edit/vitejs-vite-n4xegc?file=vite.config.js

System Info

System:
    OS: Linux 4.19 Ubuntu 20.04 LTS (Focal Fossa)
    CPU: (32) x64 AMD Ryzen Threadripper 2950X 16-Core Processor
    Memory: 45.16 GB / 50.12 GB
    Container: Yes
    Shell: 3.1.2 - /usr/bin/fish
  Binaries:
    Node: 16.13.1 - /tmp/fnm_multishells/18_1643474543039/bin/node
    Yarn: 1.22.17 - /tmp/fnm_multishells/18_1643474543039/bin/yarn
    npm: 8.1.2 - /tmp/fnm_multishells/18_1643474543039/bin/npm

Used Package Manager

yarn

Logs

No response

Validations

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[Niputi]

duplicate of #6477