fix: ssr not always working

[jasonbahl]

Description

This fixes a bug where the WordPressTemplate component would return null on the server when isPreview was null.

Related Issue(s):

fixes #1813

Testing

I tested following the steps outlined in #1813 on the reproduction mentioned in the issue.

I also was able to reproduce the issue on acf.wpgraphql.com (codebase here: https://github.com/wp-graphql/acf.wpgraphql.com) and was able to confirm that the issue is resolved for acf.wpgraphql.com with this fix in place.

Screenshots

Reproduction Site from #1813 - Before

With JavaScript disabled, the page is blank

Reproduction Site from #1813 - After

Content is rendered even with JavaScript disabled

acf.wpgraphql.com - Before

With JavaScript disabled, the page is blank

acf.wpgraphql.com - After

Content is rendered even with JavaScript disabled

[github-actions[bot]]

📦 Next.js Bundle Analysis for @faustwp/getting-started-example

This analysis was generated by the Next.js Bundle Analysis action. 🤖

🎉 Global Bundle Size Decreased

Page	Size (compressed)
global	250.52 KB (-10 B)

Details

The global bundle is the javascript bundle that loads alongside every page. It is in its own category because its impact is much higher - an increase to its size means that every page on your website loads slower, and a decrease means every page loads faster.

Any third party scripts you have added directly to your app using the <script> tag are not accounted for in this analysis

If you want further insight into what is behind the changes, give @next/bundle-analyzer a try!

[jasonbahl]

closing in favor of: https://github.com/wpengine/faustjs/pull/1939 (the # in the branch name was causing issues with automated tests)