We don't attempt to create an endpoint manager for a hint directory if there is no mapping host ID–IP corresponding to the directory's name, an IP address. That prevents a segmentation fault.
Fixesscylladb/scylladb#18649Closesscylladb/scylladb#18650
* github.com:scylladb/scylladb:
db/hints: Remove an unused header
db/hints: Remove migrating flag before initializing endpoint managers
db/hints: Prevent segmentation fault when initializing endpoint managers