Fix T73681: Python exception adding Empty objects via object_data_add

with "Enter Edit Mode" enabled

It is valild to add Empties this way, but we cannot enter editmode on
those.

release/scripts/modules/bpy_extras/object_utils.py

@@ -161,7 +161,7 @@ def object_data_add(context, obdata, operator=None, name=None):
         bpy.ops.object.mode_set(mode='EDIT')
     else:
         layer.objects.active = obj_new
-        if context.preferences.edit.use_enter_edit_mode:
+        if obdata and context.preferences.edit.use_enter_edit_mode:
             bpy.ops.object.mode_set(mode='EDIT')
 
     return obj_new