fix: getTile return type should include null

[Autsider666]

I thought EX had checks in the pipeline to prevent these types of TS inconsistencies.

[Autsider666]

What's the reasoning behind returning null instead of undefined by the way?

[eonarheim]

@Autsider666 There are various levels of strictness throughout the TS confgs unfortunately due to history, the desired end state is strict TS