Fix Nonetype has no attribute SetVisibility in _coreg.py [reopen of #13209] (#13218)

Author: psyxw

doc/changes/devel/13218.bugfix.rst

@@ -0,0 +1 @@
+Fix bug where :func:`mne.gui.coregistration` would emit an error for some CTF datasets, by :newcontrib:`Wei Xu`.

doc/changes/names.inc

@@ -317,6 +317,7 @@
 .. _Velu Prabhakar Kumaravel: https://github.com/vpKumaravel
 .. _Victor Ferat: https://github.com/vferat
 .. _Victoria Peterson: https://github.com/vpeterson
+.. _Wei Xu: https://github.com/psyxw
 .. _Will Turner: https://bootstrapbill.github.io
 .. _Xabier de Zuazo: https://github.com/zuazo
 .. _Xiaokai Xia: https://github.com/dddd1007

mne/gui/_coreg.py

@@ -1194,7 +1194,10 @@ def _set_sensors_visibility(self, state):
                 actors = self._actors[sensor]
                 actors = actors if isinstance(actors, list) else [actors]
                 for actor in actors:
+                    if actor is None:
+                        continue
                     actor.SetVisibility(state)
+
         self._renderer._update()
 
     def _update_actor(self, actor_name, actor):