Handle all problem Points

[ximenesuk]

Checking the the East West Railway file there is still one problem point:

INFO | 2023-02-23 08:39:06,975 | app.checkers | Checking against BGS data validation: LOCA within Great Britain
/media/colin/Data/repos/AGS/AGS-Validator-external/.venv/lib/python3.11/site-packages/shapely/predicates.py:798: RuntimeWarning: invalid value encountered in intersects
  return lib.intersects(a, b, **kwargs)
INFO | 2023-02-23 08:39:23,194 | app.checkers | Checking against BGS data validation: LOCA_LOCX is not duplicate of other column

This can't be empty or NaN given the recent work.