Summary:
`yarn start` in `website` crashed with
```
/Users/mweststrate/fbsource/xplat/sonar/website/node_modules/docusaurus/core/bin/docusaurus.js:50
const siteDocusaurusPackagesForUpdate = Object.keys(sitePkg.dependencies)
^
TypeError: Cannot convert undefined or null to object
at Function.keys (<anonymous>)
at Object.<anonymous> (/Users/mweststrate/fbsource/xplat/sonar/website/node_modules/docusaurus/core/bin/docusaurus.js:50:50)
```
This diff adds an empty `dependencies` section as work around. Proper patch has been made in:
https://github.com/facebook/docusaurus/pull/5204
Reviewed By: nikoant
Differential Revision: D29844597
fbshipit-source-id: 29cfad53d9ca785dd9d93c4800647add219a48ba
9c4deb3501