Returns true when the number of items across all loaded pages is not 0.
Returns true when there aren't any items and the state has already done its initial loading.
If you want to know whether there are items regardless of load state, use
Load a new page of results.
this.params object, calling
refresh if they have changed.
requestParams for converting
this.params into API parameters
Get the parameters that should be passed in the API request. Do not include page offset unless subclass overrides loadPage.
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Stored state parameters.