Fix to distinguish if the update is for node or a relationship
Added flag bool "is_node" in property_list::update_pitems() similar to property_list::add_pitems(). Reason : To distinguish if the update is for node or a relationship
Added flag bool "is_node" in property_list::update_pitems() similar to property_list::add_pitems(). Reason : To distinguish if the update is for node or a relationship