Enable narratives to source multiple builds - Add Ons#1167

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salvatore-fxpig wants to merge 2 commits intonextstrain:1050-mult-narrativesfrom salvatore-fxpig:1050-mult-narratives-more

+77-70

Commits on Jun 16, 2020

async fetching of additional datasets, remove _.uniq
salvatore-fxpig
committed
throw 404 when dataset is not available, compatibility fallback for old narratives
salvatore-fxpig
committed