Making it easier for people to know they need Entrez Direct. #2
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I didn't have Entrez Direct installed, so I was getting a bunch of empty files and no error messages.
I fixed the script to stop if the Entrez Direct tools don't work (or anything else bad happens) and added a note about the dependency.
Also, I was only running the scripts in the first place because the Arvados dataset seems to itself be a collection of empty files today. I know that that wasn't the case before, since I peeked at the FASTAs there and they had data. Has the dataset expired or something?