[Reportbug-maint] Bug#644965: reportbug -Q -N bug-ID, subsequent choice "o" -> stacktrace

[debbug]

Package: reportbug
Version: 6.2.1
Severity: serious

Description:
  - Using query mode -Q w/ -N 1234, viewing report, then selecting
    "o" in the menu crashes reportbug.

Trace:
What do you want to do now? [N|x|o|r|b|e|q|?]? ?
N - (default) Show next message (followup).
x - Provide extra information.
o - Show other bug reports (return to bug listing).
r - Redisplay this message.
b - Launch web browser to read full log.
e - Launch e-mail client to read full log.
q - I'm bored; quit please.
? - Display this help.
What do you want to do now? [N|x|o|r|b|e|q|?]? o
Traceback (most recent call last):
  File "/usr/bin/reportbug", line 2186, in <module>
    main()
  File "/usr/bin/reportbug", line 1073, in main
    return iface.user_interface()
  File "/usr/bin/reportbug", line 1354, in user_interface
    package = exinfo.package or exinfo.source
AttributeError: 'NoneType' object has no attribute 'package'


-- Package-specific info:
** Environment settings:
EDITOR="/usr/bin/vi"
INTERFACE="text"

** /home/user/.reportbugrc:
reportbug_version "3.31"
mode expert
ui text
realname "debbug"
email "lkml at think-future.com"
paranoid

-- System Information:
Debian Release: wheezy/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable'), (500, 'stable')
Architecture: i386 (i686)

Kernel: Linux 2.6.39.3 (SMP w/2 CPU cores; PREEMPT)
Locale: LANG=it_IT.UTF-8, LC_CTYPE=it_IT.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages reportbug depends on:
ii  apt               0.8.15.8
ii  python            2.7.2-8
ii  python-reportbug  6.2.1

reportbug recommends no packages.

Versions of packages reportbug suggests:
ii  debconf-utils                            1.5.40
ii  debsums                                  2.0.49
ii  dlocate                                  <none>
ii  emacs22-bin-common | emacs23-bin-common  <none>
ii  file                                     5.08-1
ii  gnupg                                    1.4.11-3
ii  pgpgpg [pgp]                             0.13-9
ii  postfix [mail-transport-agent]           2.8.3-1
ii  python-gtk2                              2.24.0-2
ii  python-gtkspell                          <none>
ii  python-urwid                             0.9.9.2-1
ii  python-vte                               1:0.28.1-2
ii  xdg-utils                                1.1.0~rc1-2

-- no debconf information