QuerySelector check missing on page.evaluate

[videki]

With docusaurus v2, autogenerated sidebars on the last page the selector gets empty, but the eval has no check for that:

`
node:internal/process/promises:246
triggerUncaughtException(err, true /* fromPromise */);
^

Error: Evaluation failed: DOMException: Failed to execute 'querySelectorAll' on 'Document': The provided selector is empty.
at puppeteer_evaluation_script:3:46
at ExecutionContext._evaluateInternal (/Users/.../node_modules/puppeteer/lib/ExecutionContext.js:122:13)
at processTicksAndRejections (node:internal/process/task_queues:96:5)
at async ExecutionContext.evaluate (/Users/.../node_modules/puppeteer/lib/ExecutionContext.js:48:12)
at async /Users/.../node_modules/mr-pdf/lib/utils.js:122:13
-- ASYNC --
at ExecutionContext. (/Users/.../node_modules/puppeteer/lib/helper.js:111:15)
at DOMWorld.evaluate (/Users/.../node_modules/puppeteer/lib/DOMWorld.js:112:20)
at processTicksAndRejections (node:internal/process/task_queues:96:5)
-- ASYNC --
at Frame. (/Users/.../node_modules/puppeteer/lib/helper.js:111:15)
at Page.evaluate (/Users/.../node_modules/puppeteer/lib/Page.js:860:43)
at Page. (/Users/.../node_modules/puppeteer/lib/helper.js:112:23)
at /Users/.../node_modules/mr-pdf/lib/utils.js:122:24
at Array.map ()
at Object.generatePDF (/Users/.../node_modules/mr-pdf/lib/utils.js:119:26)
at processTicksAndRejections (node:internal/process/task_queues:96:5)
`