astrocut readthedocs example is incomplete

[KenMighell]

In the astrocut document

https://astrocut.readthedocs.io/en/latest/astrocut/

the example given in the "Making Image Cube" section is incomplete and thus can not execute.

The line

input_files = glob("data/*ffic.fits")

refers to the data subdirectory which does not exist which causes input_files to be an empty list.

Suggest solution: Test to see if data/*ffic.fits files exist before defining input_files. If no such files exist, then create a small set of *ffic.fits images in a directory called data.