* Remove some non used *_button_register functions, panels are done in python. * Remove do_node_region_buttons, was not used anymore. Fix: * Only show Grease Pencil panel in the Node editor, when there is a valid nodetree.
* Remove some non used *_button_register functions, panels are done in python. * Remove do_node_region_buttons, was not used anymore. Fix: * Only show Grease Pencil panel in the Node editor, when there is a valid nodetree.