S3 outage now breaks page due to file length

[qqmyers]

When Amazon had a recent S3 outage (DDOS attack), I noted that Dataverse can no longer display file pages when S3 is down. Previously, the only issue with S3 being out related to operations with file upload/download and the Dataverse site itself worked. This issue now is fairly trivial - it looks like the file size to be displayed on the page is being pulled from S3 metadata and hence, if S3 is down, the page breaks/shows a 500 error. I'm not sure its worth fixing, but avoiding 500 errors could be as simple as doing a null check on the file size. (In any case, this issue might help someone debug - 500 errors related to file sizes could be due to S3 being misconfigured/down,)

[djbrooke]

Closing in favor of #7205