[Varnish] #1406: Setting a header to a falsy value than getting it returns true

[Varnish]

#1406: Setting a header to a falsy value than getting it returns true
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 Reporter:  brandonwamboldt  |       Owner:
     Type:  defect           |      Status:  new
 Priority:  high             |   Milestone:
Component:  varnishd         |     Version:  3.0.4
 Severity:  normal           |  Resolution:
 Keywords:                   |
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Comment (by scoof):

 introduced by 26b450904c39eb2b056e42846bd11be2993866e9

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1406#comment:1>
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