Handle info messages without types
Handle info messages without types

`info` message does not have to contain `type` name. For example:

{"cmd": "info",
 "text": "New beta available at: https://beta.hack.chat/ or https://beta.hack.chat/?asdasd",
 "channel": "asdasd",
 "time": 1606659611662}

Therefore it is safer to retrieve its value with `get` method to avoid
unnecessary Exception.

gkbrk/hackchat