When desired value is null, $.extract() fails catastrophically.

[Technical-13]

Code:

$.extract( { links: [ { selector: 'a', value: 'href' } ] } );

On site with links that have no href:

Gives:

TypeError: Cannot read properties of undefined (reading 'length')
    at parse (/home/container/node_modules/css-what/lib/commonjs/parse.js:84:29)
    at Object.select (/home/container/node_modules/cheerio-select/lib/index.js:191:68)
    at LoadedCheerio._findBySelector (/home/container/node_modules/cheerio/dist/commonjs/api/traversing.js:115:30)
    at LoadedCheerio.extract (/home/container/node_modules/cheerio/dist/commonjs/api/extract.js:39:28)
    at Function.extract (/home/container/node_modules/cheerio/dist/commonjs/static.js:165:24)
    at /home/container/commands/admin/foo.js:16:30
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)

[fb55]

Seems like an issue in prop, where the "href" prop doesn't support elements without this value. PRs welcome!