Fix several physics package issues

[psavery]

This fixes several places to ensure a physics package is present if it is required.

[pep8speaks]

Hello @psavery! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file hexrdgui/hexrd_config.py:

Line 520:80: E501 line too long (80 > 79 characters)

• In the file hexrdgui/polar_distortion_object.py:

Line 156:80: E501 line too long (80 > 79 characters)

Comment last updated at 2024-09-30 22:04:44 UTC