Fix uninstalling modules with deleted hooks.

[Hlavtox]

Questions	Answers
Branch?	8.1.x
Description?	If a hook was removed from database, you can no longer uninstall a module or unhook it from there. The only change is basically adding a try catch, renaming a variable for better clarity and some comments.
Type?	bug fix
Category?	BO
BC breaks?	no
Deprecations?	no
How to test?	See below
Fixed issue or discussion?	Fixes #29483
Related PRs
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How to reproduce

1. Install gsitemap native module. It adds a new hook gSitemapAppendUrls.
2. Install this tox_hooktest.zip, it hooks itself to gSitemapAppendUrls.
3. Uninstall gsitemap - it removes gSitemapAppendUrls.
4. Try to uninstall the test module - Cannot Uninstall module tox_hooktest. The hook id #405 does not exist in database.

[prestonBot]

Hi, thanks for this contribution!

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[boherm]

LGTM, thanks @Hlavtox!

[jolelievre]

Thanks @Hlavtox

[MhiriFaten]

Hello @Hlavtox ,

I have checked your PR and the uninstalling modules with deleted hooks problem is fixed.
Automated tests are OK.

[prestonBot]

QA approved, well done! Message to the maintainers: do not forget to milestone it before the merge.

[nicosomb]

Thank you @Hlavtox