TypeError is thrown when calling Crawler::html()

[syl20b]

Hello,

I'm upgrading from 2.1.0 to 2.1.1 and I encounter the following error :

TypeError: Symfony\Component\Panther\DomCrawler\Crawler::html(): Return value must be of type string, null returned

It seems that the Crawler::html() method must return a string, but as it calls the Crawler::attr() method under the hood, this can lead to a return null statement when the content is empty.

[alexandre-mace]

I'm also having the same error, temporary downgraded to 2.1.0 (my code works again now) waiting for the PR to be merged, thanks for opening this issue, you saved me a bit of time @syl20b