Describe the bug
The default policy when using ScheduledDispatchRegistry is DISPATCH_ALWAYS. However, when a dispatch predicate is set for a data loader, the shouldDispatch method should return false if the condition evaluates to false. Current behavior is that it falls through to the overall DISPATCH_ALWAYS predicate when the dataloader's dispatch predicate evaluates to false: https://github.com/graphql-java/java-dataloader/blob/master/src/main/java/org/dataloader/registries/ScheduledDataLoaderRegistry.java#L219

Is it expected that we always set an explicit overall dispatch predicate (different from DISPATCH_ALWAYS) that would serve as a backup? Currently I have to set it to either DISPATCH_NEVER or some other reasonable default that would eventually be applied so that the individual data loader dispatch predicates get a chance to be applied.