Fix a regression in 3.1.6 which resulted in not showing any images if
the associated image list was empty when it was associated with the
control, as HasImages() returned false in this case and so wxLC_ICON
style was not set.
The fix is to return true from HasImages() if we have image list even if
it is currently empty, as we can't know when (or if) it will become
non-empty and it's better to assume that it will be used (as nothing
really catastrophic should happen if it is not used, finally) rather
than not taking into account the images added to it later.
Closes#22364.
ebf5e8813e