When using play all on a playlist, nothing happens

When using play all on a playlist, nothing happens. The reason is that
the playlist is empty if we don't login. Play all work as expected if I add this line.

I have only tested this on my xbmcbuntu with a configured youtube user (actually a gmail login).

Tested on:
XBMC (13.0-ALPHA2 Git:194c408), Platform: Linux (Ubuntu 12.04.2 LTS, 3.2.0-34-generic-pae i686). Built on Apr  1 2013