Change to raise 404 error when passing incorrect parameter

[fec-jli]

Summary

What we have now
When put a bad candidate_id or committee_id on candidate and committee profile page on url,
client will get 500 server error.
example:
https://www.fec.gov/data/candidate/P800015715555555/
https://www.fec.gov/data/committee/C0058010055555/?cycle=2020

Completion criteria:

• When bad parameters are present, a 404 error should appear, not a 500

What we want?
instead of 500 error, we want to change to raise 404 error

[patphongs]

Looks like an incorrect path will get this error, I think if we fix this, we may get a 404?

Test path: http://www.fec.gov/data/candidate/P999/

cycle = max(candidate.get("rounded_election_years"))
AttributeError: 'NoneType' object has no attribute 'get'

[rfultz]

Is it actually a 404, a page not found? Or should we let it throw something like a 400, 417, 300, or a 301 so search engines know not to remember that URL