Build error when no markup.php files

[johnwatkins0]

Describe the bug

1. When running 10up-toolkit build
2. If I have no files that match the glob /path/to/my/site/wp-content/themes/my-theme/includes/blocks/**/markup.php
3. I get the following error:

ERROR in unable to locate '/path/to/my/site/wp-content/themes/my-theme/includes/blocks/**/markup.php' glob

webpack 5.75.0 compiled with 1 error in 3018 ms
npm ERR! Lifecycle script `build` failed with error:
npm ERR! Error: command failed
npm ERR!   in workspace: @my-theme/theme@1.0.0

4. And pipelines, builds, etc. can't proceed

Temporary workaround: create a markup.php file in any includes/blocks subdirectory in the theme, even if it's unused.

Steps to Reproduce

1. Create a site using 10up scaffold and using 10up-toolkit to build
2. Remove any markup.php files in the includes/blocks subdirectories.
3. Run npm run build in the theme.
4. See the rerror

Screenshots, screen recording, code snippet

Possibly related to:

10up-toolkit/packages/toolkit/config/webpack/plugins.js

Line 130 in e1124ec

useBlockAssets && {

Environment information

No response

WordPress information

Latest 10up scaffold using latest 10up-toolkit

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