[BUG] - MCNPinput.points_to_coeffs has no Return

[agrieve-cfs]

Describe the bug

Primitives of type P fail conversion due to no return from the points_to_coeffs function in MCNPInput.py

To Reproduce

Convert the following file with one of the MCNP CSG to CAD methods (here using JSON):

planes of type p
c 10x10x10cm side length box
1 0 -10 -20 -30 -40 -50 -60 imp:n=1
2 0 10:20:30:40:50:60 imp:n=0

c surfaces
10 p -5  0 -1  -5 -1  0  -5 -1 -1 $ -X
20 p  5  0  1   5  1  0   5  1  1 $ +X
30 p  0 -5 -1  -1 -5  0  -1 -5 -1 $ -Y
40 p  0  5  1   1  5  0   1  5  1 $ +Y
50 p  0 -1 -5  -1  0 -5  -1 -1 -5 $ -Z
60 p  0  1  5   1  0  5   1  1  5 $ +Z

c data
sdef
mode n
nps 10

Conversion JSON:

{
"export_cad":{
    "input_filename": "plane_box_p.inp",
    "csg_format": "mcnp",
    "output_filename" : "cad_from_csg",
    "bounding_box": [-5, -5, -5, 5, 5, 5],
    "universe_start": 0,  
    "level_max": "all",  
    "cell_range_type": "all",
    "cell_range": [],
    "mat_range_type": "all", 
    "mat_range": []
    }
}

Using GEOUNED from Conda miniforge:

(geouned_env) $ pip show geouned
Name: geouned
Version: 1.4.0

Expected behavior

Expected coefficients to be returned from points_to_coeffs function.

Error message

  File "/path/to/MCNPinput.py", line 501, in Get_primitive_surfaces
    normal = FreeCAD.Vector(coeffs[0:3])
                            ~~~~~~^^^^^
TypeError: 'NoneType' object is not subscriptable

Please complete the following information):

• OS: Linux
• GEOUNED conda miniforge version 1.4.0
• Python version 3.11.8