CurrentStore and CurrentCountry are not guaranteed to return values.

I ran into this today while doing some kernel testing. Basically, if you're installing content during a test and the SplStorage mapping of requests to stores is not cleared after a store is installed, you'll continue to get a resolved result of NULL. I think the reasonable thing to do here while maintaining BC is to add a typehint that says this could be NULL (a proper return value should be added in 3.x) as well as not statically-caching the miss.

Addressed the current store, at least. If maintainers are happy with this approach it's easy enough to extend to the other resolver.

Change looks ok, perhaps we should return NULL if $request is NULL as it can be NULL. See the CurrentLocale service.

Thanks.

NW for follow-up.