[tor-bugs] #19894 [Metrics/CollecTor]: print message when no module is activated

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#19894: print message when no module is activated
-------------------------------+---------------------------------
 Reporter:  iwakeh             |          Owner:  iwakeh
     Type:  enhancement        |         Status:  needs_review
 Priority:  Medium             |      Milestone:  CollecTor 1.1.0
Component:  Metrics/CollecTor  |        Version:
 Severity:  Minor              |     Resolution:
 Keywords:                     |  Actual Points:
Parent ID:                     |         Points:
 Reviewer:                     |        Sponsor:
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Comment (by iwakeh):

 Very good point!

 The main method now catches all `ConfigurationException`s and only prints
 the exception's message and usage.  This should be fine as
 `ConfigurationException`s can be handled by user intervention.

 Please review the
 [https://gitweb.torproject.org/user/iwakeh/collector.git/commit/?h=task-19894
 -and-task-19895&id=d9484b66e193f10cf758705919ab3a408673c7f1 latest
 commit].

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19894#comment:3>
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