Don't start another thread unless an update handler is added*
Don't start another thread unless an update handler is added*

*Also, stop sending pings, automatic reconnection from
commit fb4885a does the job better.

expectocode/Telethon,LonamiWebs/Telethon,LonamiWebs/Telethon,kyasabu/Telethon,LonamiWebs/Telethon,LonamiWebs/Telethon,andr-04/Telethon