PartPlate::check_outside: guard m_plater null deref (fix CLI rotate SIGSEGV) (#14415)

Co-authored-by: yw4z <ywsyildiz@gmail.com>

src/slic3r/GUI/NotificationManager.cpp

@@ -2338,7 +2338,7 @@ void NotificationManager::SharedProfilesNotification::render_text(ImGuiWrapper&
 	{
         float hyper_y     = starting_y + m_endlines.size() * shift_y + m_line_height * .5f;
 		float dont_show_y = hyper_y    + ImGui::CalcTextSize((m_hypertext + "  ").c_str()).y + m_line_height * .5f;
-		std::string dont_show_text = _u8L("Don't show again") + std::to_string(m_endlines.size());
+		std::string dont_show_text = _u8L("Don't show again");
 		ImVec2 part_size = ImGui::CalcTextSize(dont_show_text.c_str());
 
         if (!m_multiline && m_lines_count > 2) {

src/slic3r/GUI/PartPlate.cpp

@@ -2662,7 +2662,8 @@ bool PartPlate::check_outside(int obj_id, int instance_id, BoundingBoxf3* boundi
 
 	if (instance_box.min.z() < SINKING_Z_THRESHOLD) {
 		// Orca: For sinking object, we use a more expensive algorithm so part below build plate won't be considered
-		if (plate_box.intersects(instance_box)) {
+		// m_plater is null in CLI mode.
+		if (m_plater && plate_box.intersects(instance_box)) {
 			// TODO: FIXME: this does not take exclusion area into account
             const BuildVolume build_volume(get_shape(), m_plater->build_volume().printable_height(), m_extruder_areas, m_extruder_heights);
 			const auto state = instance->calc_print_volume_state(build_volume);