Make "download data" contents not "[]"/"undefined" #89
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Currently the download link is randomly broken because when the
url.currentref changes the<a>doesn't necessarily re-render. UsingsetStateensures that the<a>re-renders immediately when the data changes.This currently causes the behavior where the download link gives you a file containing the initial state of
data([]on the comparisons page,undefinedon the bar plots) rather than the most up-to-date contents ofdata(which should be populated once data is successfully fetched).