Handle dynamic pads.
Handle dynamic pads.

If source element doesn't have any pads, wait for a pad to be added to it
before linking it to sink.

svn path=/trunk/; revision=401

Pelagicore/Media-Manager-Rygel-patched,Pelagicore/Media-Manager-Rygel-patched,GNOME/rygel,luisbg/rygel,GNOME/rygel,jku/rygel,GNOME/rygel,Tarnyko/rygel,Pelagicore/Media-Manager-Rygel-patched,Tarnyko/rygel,jku/rygel