[Varnish] #781: Assigning empty string to bereq.url breaks

[Varnish]

#781: Assigning empty string to bereq.url breaks
----------------------+-----------------------------------------------------
 Reporter:  sky       |       Owner:  phk  
     Type:  defect    |      Status:  new  
 Priority:  normal    |   Milestone:       
Component:  varnishd  |     Version:  2.1.3
 Severity:  normal    |    Keywords:       
----------------------+-----------------------------------------------------
 vcl_miss {
  set bereq.url = req.http.foo; # where foo doesn't exist leads to

 Panic message: Assert error in VRT_l_bereq_url(), cache_vrt.c line 284:
   Condition((p) != 0) not true.

 }

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Ticket URL: <http://www.varnish-cache.org/trac/ticket/781>
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