Include "None" when when polyhedron cannot be formde

[bobleesj]

For CN below 4, make sure you assign "None" in coordination.py for the method before computing the geometric data.

            except Exception:
                print(f"Error in determining polyhedron for {label} using {method} - skipped")
                site_data[label][method] = None
                continue  # Move to the next method

And when you find the avg, min, max, make sure you have

[bobleesj]

Closing -

           if len(connection_data) > 3:
                for connection in connection_data:
                    polyhedron_points.append(connection[3])
            else:
                continue

Only when the connections_data > 3, the function polyhedron points are calculated. Then,

            # Try to make a polyhedron
            try:
                hull = ConvexHull(polyhedron_points)

            except Exception:
                print(
                    f"Error in determining polyhedron for {label} using {method} - skipped"
                )
                continue  # Move to the next method

That particular polyhedron will be caught.