[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                |       Owner:  slink
     Type:  defect                  |      Status:  closed
 Priority:  normal                  |   Milestone:  Varnish 4.0 release
Component:  varnishd                |     Version:  4.0.1
 Severity:  normal                  |  Resolution:  fixed
 Keywords:  segfault hash director  |
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Comment (by Lasse Karstensen <lkarsten@…>):

 In [2852b2d729ef0122ea6f08af2350f49ff49848f1]:
 {{{
 #!CommitTicketReference repository=""
 revision="2852b2d729ef0122ea6f08af2350f49ff49848f1"
 Skip NULL and empty arguments when hashing. Hash all other arguments.

 When multiple arguments were passed to vmod_hash_backend, only the
 first argument was re-used for the number of arguments passed.

 Fixes #1568
 }}}

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1568#comment:3>
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