CacheMap.get calls should await the promised value

[gabidi]

dataloader/src/index.js

Lines 88 to 97 in 015a94c

	var cachedPromise = cacheMap.get(cacheKey);
	if (cachedPromise) {
	var cacheHits = batch.cacheHits || (batch.cacheHits = []);
	return new Promise(resolve => {
	cacheHits.push(() => {
	resolve(cachedPromise);
	});
	});
	}
	}

Seems like this prevents the use of async calls to centralized caches in it's current implementation since the returned promise will be 'Truthy' even if it resolves with a cache miss (null, undefined).

Wondering if there is a design reason for this, or a PR is welcome ?

[vishalsingh2972]

@gabidi can you assign this to me if its still open?