[metrics-bugs] #21223 [Metrics/Metrics website]: use the empty field consistently throughout the data sets

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#21223: use the empty field consistently throughout the data sets
-------------------------------------+------------------------------
 Reporter:  iwakeh                   |          Owner:  metrics-team
     Type:  enhancement              |         Status:  needs_review
 Priority:  Medium                   |      Milestone:
Component:  Metrics/Metrics website  |        Version:
 Severity:  Minor                    |     Resolution:
 Keywords:                           |  Actual Points:
Parent ID:                           |         Points:
 Reviewer:                           |        Sponsor:
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Comment (by karsten):

 This seems to work just fine on the server.  Here's the
 [https://gitweb.torproject.org/karsten/metrics-
 web.git/commit/?h=task-21223&id=90ed8824011c16d8af4694b576a09b3e26ea2327
 patch] to review.  Thanks!

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21223#comment:4>
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