U1MS extension severely delays Banshee startup if syncdaemon cannot be started

[Iain Lane]

I have a session in which you can't start the sync daemon for whatever
reason. Probably because it's not a Unity or GNOME session
(gnome-panel/g-s-d with xmonad as WM). In this situation, the U1MS
extension tries to start syncdaemon and cannot:

  ** (Banshee:13609): DEBUG: Syncdaemon not running, waiting for it to start in NameOwnerChanged

  (Banshee:13609): libsoup-WARNING **: No feature manager for feature of type 'U1RequestChrome'

  [ here is a delay of maybe 20 seconds ]

  ** (Banshee:13609): WARNING **: Error calling get_info: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.

  ** (Banshee:13609): CRITICAL **: syncdaemon_folder_info_get_subscribed: assertion `SYNCDAEMON_IS_FOLDER_INFO (finfo)' failed
  [1 Debug 19:04:22.256] Extension source loaded: Ubuntu One Music Store

And when the source is "loaded", it just displays a message of "Cannot
resolve proxy hostname ()" when invoked.

The source should not block like this when waiting to initialise the
syncdaemon. Certainly not when loading Banshee. Further, if the source
is not going to work correctly due to syncdaemon not being loadable, it
should disable itself rather than present something which doesn't work.