DownloadButton:Button with null label (should be collapsed)

Build 5730 on v5-buttons
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Build 3454 on file-type
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NewBuild 5730 on v5-buttons
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Build 573090fdd57
Current build. There are unaccepted changes, so build 3454 is still the baseline.
Build 34541a315de current baseline
Accepted by Hannah.
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