dependents sometimes returns 0 and causes relevance issues

[Martin Kolárik]

Affects only some packages (I know about react and lodash) - humanDependents and jsDelivrHits are both zero.

[Haroen Viaene]

humanDependents and dependents is actually broken probably because npm was down during the indexing and then we go back to the fallback value, which is 0. React still seems to have a good relevance because of downloads, so it doesn't seem to be a huge issue for now.

I'd still of course like to see this fixed! :)