[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):

 Good point.  How's this (together with undoing the earlier change):

 {{{
 diff --git a/modules/clients/init-userstats.sql b/modules/clients/init-
 userstats.sql
 index 314ff58..87929b9 100644
 --- a/modules/clients/init-userstats.sql
 +++ b/modules/clients/init-userstats.sql
 @@ -706,7 +706,7 @@ CREATE OR REPLACE VIEW combined AS SELECT
    a.transport,

    -- The IP address version of this estimate, which is always ''.
 -  ''::TEXT as version,
 +  NULL::TEXT as version,

    -- Estimated fraction of nodes reporting directory requests, which is
    -- used to extrapolate observed requests to estimated total requests in
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21223#comment:3>
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