[tor-bugs] #25264 [Metrics/Website]: Decide what graph to display when there's no data to graph

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#25264: Decide what graph to display when there's no data to graph
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 Reporter:  karsten          |          Owner:  metrics-team
     Type:  enhancement      |         Status:  new
 Priority:  Low              |      Milestone:
Component:  Metrics/Website  |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:                   |  Actual Points:
Parent ID:                   |         Points:
 Reviewer:                   |        Sponsor:
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Comment (by karsten):

 Replying to [comment:2 iwakeh]:
 > For avoiding the 500 server error when trying to access the png (as
 reported in detail in #25468) an empty graph/png stating 'no data
 available for this parameter choice' should be generated.

 Sounds good. We'll also need such a static file in the PDF format. I'll
 create placeholders using R/ggplot2 in a bit. We just need to write the
 code to put them in.

 > Currently, the corresponding csv only contains the header.  Maybe, also
 add a comment here too in case no data is available.

 Sounds good, too. Want to suggest a text? I can put it in then.

 > It should be avoided to call R if there is no data available.

 Well, we need to call R to find out whether there's data available for the
 requested period of time. Or what did you mean?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25264#comment:3>
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