BUG: Bug with single channel annot

[larsoner]

Locally in MNE-Python dev I see:

$ python -ui tutorials/preprocessing/90_eyetracking_data.py
('xpos_right', 'ypos_right', 'pupil_right')
number of calibrations: 1
Calibration |
  onset: -11.543 seconds
  model: HV5
  eye: right
  average error: 0.71 degrees
  max error: 0.99 degrees
  screen size: None meters
  screen distance: None meters
  screen resolution: None pixels

offset of the first calibration point: 0.72
offset for each calibration point: [0.72 0.42 0.99 0.59 0.49]
x-coordinate for each calibration point: [ 960.  960.  960.  288. 1631.]
/home/larsoner/python/mne-python/mne/event.py:502: RuntimeWarning: invalid value encountered in cast
  data = data.astype(np.int64)
Traceback (most recent call last):
  File "/home/larsoner/python/mne-python/tutorials/preprocessing/90_eyetracking_data.py", line 208, in <module>
    raw_et.plot(
  File "/home/larsoner/python/mne-python/mne/io/base.py", line 1943, in plot
    return plot_raw(
           ^^^^^^^^^
  File "<decorator-gen-208>", line 12, in plot_raw
  File "/home/larsoner/python/mne-python/mne/viz/raw.py", line 406, in plot_raw
    fig = _get_browser(show=show, block=block, **params)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/larsoner/python/mne-python/mne/viz/_figure.py", line 704, in _get_browser
    fig = backend._init_browser(**kwargs)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/larsoner/python/mne-qt-browser/mne_qt_browser/_pg_figure.py", line 5716, in _init_browser
    browser = MNEQtBrowser(**kwargs)
              ^^^^^^^^^^^^^^^^^^^^^^
  File "/home/larsoner/python/mne-qt-browser/mne_qt_browser/_pg_figure.py", line 307, in func
    meth(self, *args, **kwargs)
  File "/home/larsoner/python/mne-qt-browser/mne_qt_browser/_pg_figure.py", line 3885, in __init__
    self._init_annot_mode()
  File "/home/larsoner/python/mne-qt-browser/mne_qt_browser/_pg_figure.py", line 5038, in _init_annot_mode
    region = self._add_region(
             ^^^^^^^^^^^^^^^^^
  File "/home/larsoner/python/mne-qt-browser/mne_qt_browser/_pg_figure.py", line 4927, in _add_region
    region = AnnotRegion(
             ^^^^^^^^^^^^
  File "/home/larsoner/python/mne-qt-browser/mne_qt_browser/_pg_figure.py", line 2682, in __init__
    self._add_single_channel_annot(ch)
  File "/home/larsoner/python/mne-qt-browser/mne_qt_browser/_pg_figure.py", line 2736, in _add_single_channel_annot
    self.single_channel_annots[ch_name] = SingleChannelAnnot(
                                          ^^^^^^^^^^^^^^^^^^^
  File "/home/larsoner/python/mne-qt-browser/mne_qt_browser/_pg_figure.py", line 2592, in __init__
    self.ypos = ypos + np.array([-0.5, 0.5])
                ~~~~~^~~~~~~~~~~~~~~~~~~~~~~
ValueError: operands could not be broadcast together with shapes (0,) (2,)