Bug#930085: reportbug gtk gui crashes

[P D <reportbug@ch.pkts.ca>]

Package: reportbug
Version: 7.5.2
Severity: important

Dear Maintainer,

* I found a bug in another package, but reportbug crashed when I tried to use it.
* When going through the initial setup, I chose the gtk gui, saved and quit, then did the following:
** Run 'reportbug' (or 'reportbug -u gtk')
** Click 'next'
** Typed any package name, e.g. 'reportbug', click 'next'
** "Checking for new versions at madison..." header shows up
** Program crashes, window disappears, error message printed:

  Traceback (most recent call last):
    File "/usr/bin/reportbug", line 2285, in <module>
      main()
    File "/usr/bin/reportbug", line 1115, in main
      return iface.user_interface()
    File "/usr/bin/reportbug", line 1728, in user_interface
      latest_first=self.options.latest_first)
    File "/usr/lib/python3/dist-packages/reportbug/ui/gtk_ui.py", line 1763, in func
      args, kwargs = op.sync_pre_operation(*args, **kwargs)
  TypeError: cannot unpack non-iterable NoneType object

Here's the contents of .reportbugrc that didn't work (comments removed):

  reportbug_version "7.5.2"
  mode standard
  ui gtk
  realname "P D"
  email "deb-bugs@ch.pkts.ca"
  no-cc
  list-cc-me
  smtphost reportbug.debian.org

By changing the line 'ui gtk' to 'ui text', I was able to make reportbug work.

Thanks!

-- Package-specific info:
** Environment settings:
EDITOR="vim"
PAGER="less"
VISUAL="vim"
INTERFACE="text"

** /home/chowes/.reportbugrc:
reportbug_version "7.5.2"
mode standard
ui text
realname "P D"
email "reportbug@ch.pkts.ca"
no-cc
list-cc-me
smtphost reportbug.debian.org

-- System Information:
Distributor ID:	Kali
Description:	Kali GNU/Linux Rolling
Release:	2019.2
Codename:	n/a
Architecture: x86_64

Kernel: Linux 4.19.0-kali5-amd64 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages reportbug depends on:
ii  apt                1.8.2
ii  python3            3.7.3-1
ii  python3-reportbug  7.5.2
ii  sensible-utils     0.0.12

reportbug recommends no packages.

Versions of packages reportbug suggests:
pn  claws-mail                                 <none>
pn  debconf-utils                              <none>
pn  debsums                                    <none>
pn  dlocate                                    <none>
pn  emacs24-bin-common | emacs25-bin-common    <none>
ii  exim4-daemon-light [mail-transport-agent]  4.92-7
ii  file                                       1:5.35-4
ii  gnupg                                      2.2.12-1
pn  python3-urwid                              <none>
pn  reportbug-gtk                              <none>
ii  xdg-utils                                  1.1.3-1

Versions of packages python3-reportbug depends on:
ii  apt                1.8.2
ii  file               1:5.35-4
ii  python3            3.7.3-1
ii  python3-apt        1.8.4
ii  python3-debian     0.1.34
ii  python3-debianbts  2.8.2
ii  python3-requests   2.21.0-1

python3-reportbug suggests no packages.

-- no debconf information