fix #78 rule is not iterable error

[lecstor]

Remove undefined values from rules array before passing to stylex babel plugin.

Logging rules just before stylexBabelPlugin.processStylexRules is called shows it has many undefined values in the array, which it does not have in the initial run when starting the devserver.

Filtering out the undefined values appears to resolve the issue.

Unfortunately I can't say how to replicate this issue, though I do know my this past message that I'm not the only one to see it.. https://github.com/HorusGoul/vite-plugin-stylex/issues/24#issuecomment-1870977440

{
  rules: [
    undefined,
    undefined,
    [ 'xngnso2', [Object], 3000 ],
    [ 'x1evy7pa', [Object], 3000 ],
    [ 'x10ipcqr', [Object], 3000 ],
    undefined,
    undefined,
    undefined,
    [ 'x78zum5', [Object], 3000 ],
    [ 'xdt5ytf', [Object], 3000 ],
    [ 'x6s0dn4', [Object], 3000 ],
    [ 'xagnifm', [Object], 1200 ],
    undefined,
  ]
}

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 3f167276a04d80107dffdc2d914a746101ea9e3a

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ------------------ | ----- | | vite-plugin-stylex | Patch |

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[HorusGoul]

Thanks for the contribution!