Bug#756162: nonexistent target release makes "apt update" segfault

[Jakub Wilk <jwilk@debian.org>]

* Michael Vogt <mvo@debian.org>, 2014-07-29, 18:05:
> I wasn't able to reproduce this crash. Could you please try to get a 
> gdb backtrace

Here it goes:

(gdb) bt
#0  0x00007ffff7785d6e in pkgDepCache::PkgBegin (this=0x0) at ../build/include/apt-pkg/depcache.h:355
#1  0x00007ffff779c19b in DoUpdate (CmdL=...) at /build/apt-S02Gn6/apt-1.0.6/apt-private/private-update.cc:83
#2  0x00007ffff7b7743e in CommandLine::DispatchArg (this=0x7fffffffeab0, Map=0x7fffffffead0, NoMatch=true) at /build/apt-S02Gn6/apt-1.0.6/apt-pkg/contrib/cmndline.cc:380
#3  0x0000000000401e05 in main (argc=4, argv=0x7fffffffeca8) at /build/apt-S02Gn6/apt-1.0.6/cmdline/apt.cc:154

--
Jakub Wilk