Add error handler for 404 not found

[jonodrew]

This will help in the case of users asking for data that's already been deleted

[jonodrew]

Better late than never, some error handling!

@johnpeart is there a pre-existing 404 error page we can re-use for this?

[github-actions]

✅ Result of Pytest Coverage

---------- coverage: platform linux, python 3.9.13-final-0 -----------

Name	Stmts	Miss	Cover
/app/init.py	22	0	100%
/app/auth/init.py	3	0	100%
/app/auth/routes.py	17	2	88%
/app/classes.py	83	3	96%
/app/config.py	10	1	90%
/app/errors/init.py	3	0	100%
/app/errors/errors.py	5	5	0%
/app/extensions.py	3	0	100%
/app/helpers.py	71	27	62%
/app/main/init.py	7	1	86%
/app/main/routes.py	127	14	89%
/app/tasks/init.py	10	2	80%
/app/tasks/helpers.py	11	4	64%
/app/tasks/tasks.py	34	0	100%
TOTAL	406	59	85%
=======================	35	passed,	45

[johnpeart]

We have a 404 page on the main website, here:
https://github.com/civilservicelgbt/magenta/blob/main/_layouts/four-oh-four.html

Does that work?

[jonodrew]

That looks great! Then I think it'll just be a matter of copy-pasting it into this repo

…

On Sat, 25 Jun 2022, 21:25 John Peart, ***@***.***> wrote: We have a 404 page on the main website, here: https://github.com/civilservicelgbt/magenta/blob/main/_layouts/four-oh-four.html Does that work? — Reply to this email directly, view it on GitHub <#105 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AA2ATLUXF4RZMQFLJGCC46DVQ5TM3ANCNFSM5Z2I4HYA> . You are receiving this because you authored the thread.Message ID: ***@***.***>