TypeError on Philips CT import

[Ed McDonagh]

File "/var/dose/veopenrem3/lib/python3.10/site-packages/openrem/remapp/extractors/ct_philips.py",
 line 164, in _ctaccumulateddosedata ctacc.ct_dose_length_product_total = Decimal
 ( TypeError: conversion from NoneType to Decimal is not supported

‌

[Ed McDonagh]

Adding try/except to CT DLP Total on Philips import, refs #967

→ <<cset 552f6408ceb1>>

[Ed McDonagh]

Adding ref #967 to changes.

→ <<cset 661a46f9aada>>

[Ed McDonagh]

Merged in issue967philipsimporterror (pull request #551)

Fixes #967 Approved-by: David Platten

→ <<cset 8ce96fc6f3b7>>