Downloading invalid codeforces contest raises error

[adityaa30]

Downloading a codeforces contest which does not exists or has not started yet raises a ParserError.

Minimal Steps to reproduce

cpcli -c cf:12227 download

[nimeshvashistha]

Hi, I'd like to take this up.

[adityaa30]

@nimeshvashistha Hey! Sure, go ahead.