Find references button doesn't show if token is hovered before provider is registered
Created by: felixfbecker
Similar to https://github.com/sourcegraph/sourcegraph/issues/9349.
A "find references" button is not shown if there is a null definition emitted before the loader delay. If no providers are registered yet, null is emitted immediately, meaning the "find references" button will never show up, even after the providers were registered and emitted non-null.
Reported in https://github.com/sourcegraph/sourcegraph/issues/9346