[change] torrentleech: Show reasonable error if login to to torrentleech.org fails (#2256)
[change] torrentleech: Show reasonable error if login to to torrentleech.org fails (#2256)

* Show reasonable error if login to to torrentleech.org fails
- A Dubious JSON error was shown if the login failed

Flexget/Flexget,crawln45/Flexget,ianstalk/Flexget,ianstalk/Flexget,tobinjt/Flexget,malkavi/Flexget,tobinjt/Flexget,Danfocus/Flexget,tobinjt/Flexget,gazpachoking/Flexget,Danfocus/Flexget,JorisDeRieck/Flexget,crawln45/Flexget,gazpachoking/Flexget,malkavi/Flexget,Danfocus/Flexget,Danfocus/Flexget,tobinjt/Flexget,JorisDeRieck/Flexget,malkavi/Flexget,ianstalk/Flexget,JorisDeRieck/Flexget,crawln45/Flexget,JorisDeRieck/Flexget,malkavi/Flexget,Flexget/Flexget,Flexget/Flexget,Flexget/Flexget,crawln45/Flexget