shading menu for with objects and without objects

shading.py

class PieRMB(Menu):
    bl_idname = "pie.shadingview"
    bl_label = "Viewport Shading "

    def draw(self, context):
        layout = self.layout
        pie = layout.menu_pie()
         
        obj = context.object

        if not obj:

            scene = context.scene
            view = context.space_data
                 
            #4 - LEFT
            f = pie.operator("wm.context_set_enum", icon='WIRE', text='Wires')
            f.data_path='space_data.viewport_shade'
            f.value = 'WIREFRAME'
            #6 - RIGHT
            pie.operator("object.hide_view_clear", text="Show Object")                
            #2 - BOTTOM
            box = pie.split().box().column()
            row = box.row()
            box.operator("OBJECT_OT_shade_smooth", text="Object Smooth")
            row = box.row()
            box.operator("OBJECT_OT_shade_flat", text="Object Flat")
            box.separator()
            box.operator("calculate.normal", text="Calculate Normals")
            box.separator()
            box.prop(view, "use_matcap")
            box.template_icon_view(view, "matcap_icon")
            #8 - TOP
            f = pie.operator("wm.context_set_enum", icon='SMOOTH', text='Rendered')
            f.data_path='space_data.viewport_shade'
            f.value = 'RENDERED'
            #7 - TOP - LEFT
            f = pie.operator("wm.context_set_enum", icon='SOLID', text='Solid')
            f.data_path='space_data.viewport_shade'
            f.value = 'SOLID' 
            #9 - TOP - RIGHT
            f = pie.operator("wm.context_set_enum", icon='MATERIAL', text='Material')
            f.data_path='space_data.viewport_shade'
            f.value = 'MATERIAL'
            #1 - BOTTOM - LEFT
            pie.operator("object.hide_view_set", text="Hide Object Selected").unselected=False
            #3 - BOTTOM - RIGHT
            pie.operator("object.hide_view_set", text="Hide Object Unselected").unselected=True
            
        else:
            mesh = context.active_object.data
            scene = context.scene
            view = context.space_data
                 
            #4 - LEFT
            f = pie.operator("wm.context_set_enum", icon='WIRE', text='Wires')
            f.data_path='space_data.viewport_shade'
            f.value = 'WIREFRAME'
            #6 - RIGHT
            pie.operator("object.hide_view_clear", text="Show Object")                
            #2 - BOTTOM
            box = pie.split().box().column()
            row = box.row()
            box.operator("OBJECT_OT_shade_smooth", text="Object Smooth")
            row = box.row()
            box.operator("OBJECT_OT_shade_flat", text="Object Flat")
            box.separator()
            box.operator("calculate.normal", text="Calculate Normals")
            box.separator()
            row = box.row()
            row.prop(mesh, "use_auto_smooth")
            row = box.row()
            row.prop(mesh, "auto_smooth_angle", text="Angle")
            box.separator()
            box.prop(view, "use_matcap")
            box.template_icon_view(view, "matcap_icon")
            #8 - TOP
            f = pie.operator("wm.context_set_enum", icon='SMOOTH', text='Rendered')
            f.data_path='space_data.viewport_shade'
            f.value = 'RENDERED'
            #7 - TOP - LEFT
            f = pie.operator("wm.context_set_enum", icon='SOLID', text='Solid')
            f.data_path='space_data.viewport_shade'
            f.value = 'SOLID' 
            #9 - TOP - RIGHT
            f = pie.operator("wm.context_set_enum", icon='MATERIAL', text='Material')
            f.data_path='space_data.viewport_shade'
            f.value = 'MATERIAL'
            #1 - BOTTOM - LEFT
            pie.operator("object.hide_view_set", text="Hide Object Selected").unselected=False
            #3 - BOTTOM - RIGHT
            pie.operator("object.hide_view_set", text="Hide Object Unselected").unselected=True