Fix try except pass

[galenseilis]

There is the following lines of code in import_params.py.

Generally "bare excepts" like this are discouraged:

• https://stackoverflow.com/questions/54948548/what-is-wrong-with-using-a-bare-except
• https://docs.astral.sh/ruff/rules/bare-except/
• https://pylint.pycqa.org/en/latest/user_guide/messages/warning/bare-except.html

There is even PEP760 which proposes disallowing them altogether.

https://peps.python.org/pep-0760/

I suggest we find out what all the branches are and treat them explicitly instead of a catch-all try except.

[galenseilis]

Not only is it a bare except, but it is also letting w/e exceptions occur to pass silently:

https://stackoverflow.com/questions/21553327/why-is-except-pass-a-bad-programming-practice

https://peps.python.org/pep-0020/

[geraintpalmer]

Addressed here: e8b46c6