AdultSwim stream broken

Checklist

[x] This is a bug report.
[ ] This is a feature request.
[ ] This is a plugin (improvement) request.
[x] I have read the contribution guidelines.

Description

running streamlink.exe http://www.adultswim.com/videos/streams best does not open the AdultSwim stream.

Expected / Actual behavior

Expected: open the AdultSwim stream

Actual behavior: error: Unable to validate JSON: Unable to validate key 'streams': Key 'isLive' not found in {'description': 'Walk with Him all-day long.', 'email': '', 'archiveCollection': [], 'stream': 'At-rci-fT1SgqmQ2ZA5XtQ', 'id': 'black-jesus', 'pipVideoID': '', 'chat': '', 'doc_id': 'video_stream_shows_black_jesus_marathon', 'showLinks': [{'external': False, 'value': 'More Black Jesus', 'url': 'http://www.adultswim.com/videos/black-jesus/'}, {'external': False, 'value': 'Facebook', 'url': 'http://www.facebook.com/BlackJesus'}, {'external': True, 'value': 'Twitter', 'url': 'https://twitter.com/blackjesusshow'}], 'url': 'http://www.adultswim.com/videos/streams/black-jesus/', 'telephone': '', 'schedule': [], 'images': {'video': 'http://i.cdn.turner.com/adultswim/big/video/black-jesus-marathon/marathonStream_blackjesus.jpg'}, 'chatService': 'http://www.adultswim.com/utilities/api/v1/live/chat/black-jesus', 'type': 'marathon', 'archiveEpisodes': [], 'sponsor':{'link': '', 'title': '', 'imageUrl': ''}, 'title': 'Black Jesus', 'rating': 'TV-MA'}

Reproduction steps / Explicit stream URLs to test

look above

Environment details

Operating system and version: Windows 7 64bit Streamlink and Python version: Python 3.5.2/Streamlink 0.7.0

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