qtoutv: Show error message when episode playlist returns 404

This just happened to me. Trying to download the latest episode of Infoman
gave me this:

Traceback (most recent call last):
  File "/home/simark/src/pytoutv/toutvqt/main_window.py", line 168, in _on_select_download
    bitrates = episodes[0].get_available_bitrates()
  File "/home/simark/src/pytoutv/toutv/bos.py", line 437, in get_available_bitrates
    playlist = toutv.dl.Downloader.get_episode_playlist(self, proxies)
  File "/home/simark/src/pytoutv/toutv/dl.py", line 143, in get_episode_playlist
    pl, cookies = Downloader.get_episode_playlist_cookies(episode, proxies)
  File "/home/simark/src/pytoutv/toutv/dl.py", line 133, in get_episode_playlist_cookies
    r = Downloader._do_request(url, proxies=proxies, timeout=15)
  File "/home/simark/src/pytoutv/toutv/dl.py", line 98, in _do_request
    r.status_code)
toutv.exceptions.UnexpectedHttpStatusCode: Unexpected HTTP response code 404 for "http://cp143903-f.akamaihd.net/i/012/mp4/i/2014-11-20_19_30_00_infoman_0384_,400,500,800,1200,2000,3000,.mp4.csmil/master.m3u8?hdnea=st=1416543184~exp=1416543199~acl=/i/012/mp4/i/2014-11-20_19_30_00_infoman_0384_*~hmac=b0704a0495d1303d671d05414f1f2a5d09b547c87266a9beaf870ac6e0cdf2f2"

I tried to check on the website, the episode is listed, but I can't watch
it. My guess is that it's not fully available yet, maybe they are currently
adding it...