Catch undefined child

Had an error using `cheerio`. This is the best fix that I can think of. Here's the stack trace : 

TypeError: Cannot read property 'type' of undefined
    at module.exports.isTag (my_project\node_modules\cheerio\node_modules\CSSselect\node_modules\domutils\node_modules\domelementtype\index.js:12:14)
    at findAll (my_project\node_modules\cheerio\node_modules\CSSselect\node_modules\domutils\lib\querying.js:91:7)
    at findAll (my_project\node_modules\cheerio\node_modules\CSSselect\node_modules\domutils\lib\querying.js:95:27)
    at findAll (my_project\node_modules\cheerio\node_modules\CSSselect\node_modules\domutils\lib\querying.js:95:27)
    at findAll (my_project\node_modules\cheerio\node_modules\CSSselect\node_modules\domutils\lib\querying.js:95:27)
    at findAll (my_project\node_modules\cheerio\node_modules\CSSselect\node_modules\domutils\lib\querying.js:95:27)
    at Object.findAll (my_project\node_modules\cheerio\node_modules\CSSselect\node_modules\domutils\lib\querying.js:95:27)
    at selectAll (my_project\node_modules\cheerio\node_modules\CSSselect\index.js:25:70)
    at select (my_project\node_modules\cheerio\node_modules\CSSselect\index.js:20:10)
    at CSSselect (my_project\node_modules\cheerio\node_modules\CSSselect\index.js:40:9)