Bare OSError if the trash is not found when trying to delete a file

[Guilherme Salgado]

In order to do QA on staging we run a separate syncdaemon with the HOME env var set to something else, which works fine most of the cases, but fails when the SD gets notified about a file deletion -- it will just log a warning

  ubuntuone.SyncDaemon.fsm - WARNING - OSError when trying to remove file/dir '/tmp/u1test/Ubuntu One/bar'

and leave the file untouched. After digging a bit, it turns out this is because move_to_trash() will convert any GLib.GError raised by .trash() into a bare OSError with code=2 and no error message.

FWIW, the error raised by .trash() in this case is this: GError('Unable to find or create trash directory',)