Remove the early return when generating sitemap

[horstleung]

avoid breaking getting config by webpack function

Description

The webpack config is returned too early when it is isServer.

Related Issue

Nope.

Motivation and Context

Get custom config with input webpack function.

How Has This Been Tested?

Working in my local machine and deployed to Vercel successfully.

Types of changes

• [x ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[horstleung]

Hi @fattomhk, :) I do hope that you will make a PR if this was an issue that I missed. Thank you for noticing it if it happened to you

Done. Sorry for not having time to test it.

[ReeceM]

Done. Sorry for not having time to test it.

Hi @fattomhk, thank you making the fix, very much appreciated. I will double check it again and the Github Actions should also run 👍