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GetGuildHistoryEventIndicesForTimeRange only operates on the cached data (no server interaction involved).
It will simply return nil if the range does not contain any events or give you whatever the cache contains when you call, even if it's incomplete.
In case you do a server request and try to get a range that does not have any events stored on the server, it will finish the request and simply not return data. Doesn't matter if it's past the time limit, or inside the range, but in a guild that has not generate any events in that period.
There are never gonna be any errors for calling any of the new api functions (except for type errors maybe).
Two more things that may also be good to know:
Unlike the old api, the new history will always sort the data when anything is received, so all indices are ordered by time. That means you should always invalidate any indices when the update event fires, since the event it points to may have changed.
The other thing is that the local part of the api is equivalent to the cache. That means GetNumGuildHistoryEvents will return the overall number of events in the cache for that category. There is no extra loading step involved, which also means that longer cache times will mean longer loading times (as before with LibHistoire).
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