[Varnish] #1568: director.hash with req.http.Cookie && empty req.http.Cookie results in SIGSEGV

[Varnish]

#1568: director.hash with req.http.Cookie && empty req.http.Cookie results in
SIGSEGV
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 Reporter:  zviratko                |       Type:  defect
   Status:  new                     |   Priority:  normal
Milestone:  Varnish 4.0 release     |  Component:  varnishd
  Version:  4.0.1                   |   Severity:  normal
 Keywords:  segfault hash director  |
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 If req.http.Cookie is empty and you are using it as a key for hash
 director, request results in SIGSEGV of the varnishd process.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1568>
Varnish <https://varnish-cache.org/>
The Varnish HTTP Accelerator