pornhub categories and tags not parsing

[burnersauce]

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.07.23. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

Add -v flag to your command line you run youtube-dl with, copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

 $ youtube-dl -v --skip-download --write-info-json https://www.pornhub.com/view_video.php\?viewkey\=ph589177565b9e6
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '--skip-download', '--write-info-json', 'https://www.pornhub.com/view_video.php?viewkey=ph589177565b9e6']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.07.23
[debug] Python version 3.6.1 - Darwin-13.4.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 3.2.2, ffprobe 3.2.2, rtmpdump 2.4
[debug] Proxy map: {}
[PornHub] ph589177565b9e6: Downloading webpage
[PornHub] ph589177565b9e6: Downloading webpage
[info] Writing video description metadata as JSON to: Behind the scenes on set!-ph589177565b9e6.info.json
<end of log>

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Description of your issue, suggested solution and other information

The current parsing does not correctly capture categories and tags (used when extracting info as json). The current implementation seeks to read the categories and tags out of the page_params field. The page params, however, do not currently contain this info. Instead, they only contain the keys: ['height', 'width', 'zoneId', 'special', 'dynamicId', 'adTypeParent', 'adTypeChild', 'frameId']. As such, all pages have the categories value as [] and likewise for the tags value.