youtube: URLs are permanently deleted from the playback queue in the presence of temporary communication errors

[juanrubio]

ERROR: Unable to download webpage: <urlopen error EOF occurred in violation of protocol (_ssl.c:590)> (caused by URLError(SSLEOFError(8, u'EOF occurred in violation of protocol (_ssl.c:590)'),))
[YouTube] Could not retrieve the audio stream URL for 'zhyaAPsT1LU' (Attempt 3 of 5).

The permanent removal of URLs from the playback queue causes the queue to become empty after a while. Temporary communication errors should not lead to URL removal.

Solution:

• The URLs should be kept in the queue, to be retried at a later time. If any urls contain audio data that the graph can currently handle (like ogg), the stream URL will be kept, which is not ideal, but at least we won't leak URLs that have temporary resolution problems.