[Varnish] #1218: String concatenation operator '+' doesn't work on empty strings

[Varnish]

#1218: String concatenation operator '+' doesn't work on empty strings
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 Reporter:  jafcobend  |       Owner:
     Type:  defect     |      Status:  new
 Priority:  normal     |   Milestone:
Component:  varnishd   |     Version:  3.0.3
 Severity:  normal     |  Resolution:
 Keywords:             |
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Comment (by Poul-Henning Kamp <phk@…>):

 In [0e984bd491faa3742601ee8c64a69955445bc7a0]:
 {{{
 #!CommitTicketReference repository=""
 revision="0e984bd491faa3742601ee8c64a69955445bc7a0"
 Make

 set req.http.Cookie = req.http.Cookie + " " + req.http.Cookie-sess;

 do the obvious thing, even if req.http.Cookie does not exist.

 The underlying issue was a badly though through overloading of
 the NULL value to mean "Unset".  Now it has its own magic marker.

 Fixes #1218
 }}}

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1218#comment:1>
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