Closed Unassigned: avoid using exceptions for json parsing in _parse_token_from_json [183]

If possible, I'd like to avoid use of exceptions when parsing JSON payload.

If for no other reason, this makes debugging extremely annoying (I debug with exceptions ON).

See my change:

https://casablanca.codeplex.com/SourceControl/network/forks/tsone/casadev/changeset/22558b50e52ed8747bb3df0a2764526a8f8e33b3
Comments: Verified, closing.