[BUG] Adding new tags breaks the site

[vhvb1989]

Repro:
Add a new template in /static/templates.json with a tag like foo (or something more meaningful like:

"tags": [
      "webcomponents",
      "microfrontend"
]

When building the site, the next error is displayed:

✖ Server
  Compiled with some errors in 5.86s

[ERROR] Docusaurus server-side rendering could not render static page with path /.


TypeError: Cannot read properties of undefined (reading 'includes')
    at Array.filter (<anonymous>)
[ERROR] Unable to build website for locale en.
[ERROR] Error: Failed to compile with errors.
    at /home/vivazqu/workspace/awesome-azd/website/node_modules/@docusaurus/core/lib/webpack/utils.js:180:24
    at /home/vivazqu/workspace/awesome-azd/website/node_modules/webpack/lib/MultiCompiler.js:554:14
    at processQueueWorker (/home/vivazqu/workspace/awesome-azd/website/node_modules/webpack/lib/MultiCompiler.js:491:6)
    at process.processTicksAndRejections (node:internal/process/task_queues:77:11)

Related: #235
issue: https://github.com/Azure/awesome-azd/actions/runs/6666384881/job/18117813190#step:4:39