dials.predict ignore_shadows=False is broken

[dagewa]

          @graeme-winter I tried testing this with any old data set:

dials.predict $(dials.data get -q centroid_test_data)/indexed.expt ignore_shadows=False
The following parameters have been modified:

ignore_shadows = False
input {
  experiments = /home/fcx32934/sw/cctbx/build/dials_data/centroid_test_data/indexed.expt
}

Traceback (most recent call last):
  File "/home/fcx32934/sw/cctbx/build/../modules/dials/src/dials/command_line/predict.py", line 141, in <module>
    run()
  File "/home/fcx32934/sw/cctbx/conda_base/lib/python3.10/contextlib.py", line 79, in inner
    return func(*args, **kwds)
  File "/home/fcx32934/sw/cctbx/build/../modules/dials/src/dials/command_line/predict.py", line 137, in run
    script.run(args)
  File "/home/fcx32934/sw/cctbx/build/../modules/dials/src/dials/command_line/predict.py", line 118, in run
    shadowed = filter_shadowed_reflections(
  File "/home/fcx32934/sw/cctbx/modules/dials/src/dials/algorithms/shadowing/filter.py", line 19, in filter_shadowed_reflections
    shadow = masker.project_extrema(
AttributeError: Please report this error to dials-support@lists.sourceforge.net: 'NoneType' object has no attribute 'project_extrema'

Seems to me that the shadowing stuff you added is broken? This error is the same on main.

Originally posted by @dagewa in #2553 (comment)