[tor-bugs] #19021 [Metrics/CollecTor]: improve configuration process

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#19021: improve configuration process
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 Reporter:  iwakeh             |          Owner:  iwakeh
     Type:  enhancement        |         Status:  needs_review
 Priority:  High               |      Milestone:
Component:  Metrics/CollecTor  |        Version:
 Severity:  Normal             |     Resolution:
 Keywords:  ctip operation     |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
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Comment (by iwakeh):

 errata:
 * running without args gives the usage
 * running with a module specified, but either no default or missing or
 empty properties file will write default properties.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19021#comment:6>
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