recent ctapipe-process crashes on public MC files

[Tobychev]

Describe the bug
ctapipe-process crashes when running on the public MC files

To Reproduce
ctapipe-process --input PublicMC/gamma-diffuse_with_images_00.dl2.h5

Expected behavior
That a dl2 level file is produced.

Supporting information

2024-10-24 00:38:56,988 ERROR [ctapipe.ctapipe-process] (tool.run): Caught unexpected exception: 'NoneType' object has no attribute 'geodetic'
Traceback (most recent call last):
  File "/local/home/tb273079/DataPipe/ctapipe-dev/src/ctapipe/core/tool.py", line 431, in run
    self.start()
  File "/local/home/tb273079/DataPipe/ctapipe-dev/src/ctapipe/tools/process.py", line 294, in start
    self.event_source.subarray.info(printer=self.log.info)
  File "/local/home/tb273079/DataPipe/ctapipe-dev/src/ctapipe/instrument/subarray.py", line 130, in info
    printer(f"Height   : {self.reference_location.geodetic.height:.2f}")

Additional context
Add any other context about the problem here.