sip_im_session2: print incoming session contents

darcs-hash:20090313143121-b2873-4409d5e67097a025e8ed051bf5ba4c1061789584
Fixed bugs with empty list or dict as default keyword agrument in core

darcs-hash:20090313155944-58103-91ab3160099ce1822623da10211169c1f39a7bb7