CSS Modules pattern crashes using [name]

Specifying any pattern in the cssModules option which includes [name] crashes for me with the following message:

thread '<unnamed>' panicked at 'called `Option::unwrap()` on a `None` value', /Users/runner/work/lightningcss/lightningcss/src/css_modules.rs:119:39
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

For example with the code from the docs:

const {code, map, exports} = transform({
  cssModules: {
    pattern: 'my-company-[name]-[hash]-[local]'
  },
  code: Buffer.from(`
    .logo {
      background: skyblue;
    }
  `)
})

Removing the [name] segment builds as expected

Start at src/css_modules.rs:119 and reproduce the crash with the CSS Modules pattern from the issue body, including [name]. Confirm the fix by rerunning that example and checking that the transformation completes without a panic and produces the expected class name.