[Varnish] #913: Regsub on unset header doesn't work, but autovivifies

[Varnish]

#913: Regsub on unset header doesn't work, but autovivifies
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  Reporter:  jib     |        Type:  defect
    Status:  closed  |    Priority:  normal
 Milestone:          |   Component:  build 
   Version:  2.1.5   |    Severity:  normal
Resolution:  fixed   |    Keywords:        
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Changes (by Poul-Henning Kamp <phk@…>):

  * status:  new => closed
  * resolution:  => fixed


Comment:

 (In [25228a235b50c2e3b224a08473954bc99cf1d365]) VCL regexp and regsub
 should treat a NULL argument as an empty
 string.

 Fixes   #913

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Ticket URL: </ticket/913#comment:2>
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