When running meld with $DISPLAY unset: meld crashed with AttributeError in __main__: 'NoneType' object has no attribute 'append_search_path'

[Daniel Holbert]

Binary package hint: meld

STEPS TO REPRODUCE:
* Run the following command:
     DISPLAY="" meld
Alternately, run "ssh localhost" (assuming X isn't forwarded by default) and then run meld.

ACTUAL RESULTS: This crash.

Ubuntu version: 11.04 beta2
Meld version: 1.5.0-0ubuntu1

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: meld 1.5.0-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Fri Apr 15 08:19:12 2011
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/meld
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110413)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/meld
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LC_COLLATE=POSIX
 LANG=en_US.UTF-8
PythonArgs: ['/usr/bin/meld']
SourcePackage: meld
Title: meld crashed with AttributeError in __main__: 'NoneType' object has no attribute 'append_search_path'
Traceback:
 Traceback (most recent call last):
   File "/usr/bin/meld", line 125, in <module>
     gtk.icon_theme_get_default().append_search_path(meld.paths.icon_dir())
 AttributeError: 'NoneType' object has no attribute 'append_search_path'
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Daniel Holbert (dholbert)]

Output on the command line when this happens:
/usr/lib/pymodules/python2.7/gtk-2.0/gtk/__init__.py:57: GtkWarning: could not open display
  warnings.warn(str(e), _gtk.Warning)
/usr/bin/meld:125: GtkWarning: IA__gtk_icon_theme_get_for_screen: assertion `GDK_IS_SCREEN (screen)' failed
  gtk.icon_theme_get_default().append_search_path(meld.paths.icon_dir())
Traceback (most recent call last):
  File "/usr/bin/meld", line 125, in <module>
    gtk.icon_theme_get_default().append_search_path(meld.paths.icon_dir())
AttributeError: 'NoneType' object has no attribute 'append_search_path'

Basically, meld just needs to exit gracefully where there's no display. (rather than crashing)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Rolf Leggewie (r0lf)]

Still the same problem in bionic