* Fixes chem and addiction scans, null checks for addiction_list (#55105)
So #54797 changed addiction_list to instantiate as a null instead of a list. Turns out a few things relied on the list existing!
Things like health analyser/medical kiosk chem and addiction scans broke, and smokers would no longer get addicted!
Made a few places check if addiction_list is null before continuing.
(Lemon's note, refactored some code to make it cleaner/removed some unneeded loop typechecks)
* Fixes chem and addiction scans, null checks for addiction_list
Co-authored-by: prodirus <44090982+prodirus@users.noreply.github.com>
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