Raise ConnectionError when sending without connection
Raise ConnectionError when sending without connection

Otherwise the program could potentially block on await client(...)
since this has no timeout (unless asyncio.wait_for() was used) and
would give no further hint that the program was halted there.

LonamiWebs/Telethon,expectocode/Telethon,LonamiWebs/Telethon,LonamiWebs/Telethon,LonamiWebs/Telethon