@parcel/packager-js: Got unexpected null with CSS module composes

[mischnic]

🐛 bug report

A CSS module file useing composes fails with this error:

@parcel/packager-js: Got unexpected null

  Error: Got unexpected null
      at nullthrows (node_modules/nullthrows/nullthrows.js:7:15)
      at node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:918:51
      at Array.every (<anonymous>)
      at node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:917:35
      at Array.filter (<anonymous>)
      at ScopeHoistingPackager.buildAssetPrelude (node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:907:60)
      at ScopeHoistingPackager.buildAsset (node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:393:48)
      at ScopeHoistingPackager.visitAsset (node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:348:17)
      at node_modules/@parcel/packager-js/lib/ScopeHoistingPackager.js:448:58
      at String.replace (<anonymous>)

🤔 Expected Behavior

Works

😯 Current Behavior

Fails with the error

💁 Possible Solution

🔦 Context

Originally reported by @arty-name in #8375 (comment)

💻 Code Sample

Minimal reproduction: https://github.com/mischnic/parcel-issue-9634

🌍 Your Environment

Software	Version(s)
Parcel	e60cbeb
Node
npm/Yarn
Operating System