Zooming with a colorbar gives an error

[esheldon]

Adding a colorbar and then using the zoom feature gives an error

matplotlib 3.8
healsparse 1.10.1
skyproj 1.2.4

Example

import numpy as np
import healsparse
import hpgeom
import matplotlib.pyplot as mplt
import skyproj

def main():
    nside = 256

    area = hpgeom.nside_to_pixel_area(nside=nside)

    radius_degrees = np.sqrt(area) / 2
    print(f'radius {radius_degrees:.3g} degrees')

    ras, decs = 200, 75
    pixelnum = hpgeom.angle_to_pixel(nside, ras, decs)

    ra, dec = hpgeom.pixel_to_angle(nside=nside, pix=pixelnum)

    circ = healsparse.Circle(ra=ra, dec=dec, radius=radius_degrees, value=1)
    smap = circ.get_map(nside_coverage=32, nside_sparse=nside, dtype=np.int16)

    fig, ax = mplt.subplots(figsize=(8, 8))
    sp = skyproj.McBrydeSkyproj(ax=ax)
    im, lon_raster, lat_raster, values_raster = sp.draw_hspmap(
        smap,
        lat_range=[dec-radius_degrees*8, dec+radius_degrees*8],
        lon_range=[ra-radius_degrees*2, ra+radius_degrees*2],
    )
    sp.draw_inset_colorbar()

    mplt.show()

main()

Traceback (most recent call last):
  File "/home/esheldon/miniforge3/envs/test/lib/python3.12/site-packages/matplotlib/cbook.py", line 298, in process
    func(*args, **kwargs)
  File "/home/esheldon/miniforge3/envs/test/lib/python3.12/site-packages/skyproj/_skyproj.py", line 869, in _change_axis
    mappable = ScalarMappable(map_norm, cmap=self._redraw_dict['colorbar'].cmap)
                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'cmap'

[esheldon]

Note this error is reported, but it seems to be caught. So python continues to run after this error is reported.

[esheldon]

The error is gone with 2.0beta