[alacarte] MenuEditor: deal with the case of having no $XDG_MENU_PREFIX

[Jasper St. Pierre <jstpierre src gnome org>]

commit fe7211f2eb4c8bcf7cbddca75bf4e28ee7b98659
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Mon Oct 22 23:08:38 2012 -0400

    MenuEditor: deal with the case of having no $XDG_MENU_PREFIX

 Alacarte/MenuEditor.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/Alacarte/MenuEditor.py b/Alacarte/MenuEditor.py
index 386b382..8d992ca 100644
--- a/Alacarte/MenuEditor.py
+++ b/Alacarte/MenuEditor.py
@@ -23,7 +23,7 @@ from gi.repository import GMenu, GLib
 from Alacarte import util
 
 class MenuEditor(object):
-    def __init__(self, name=os.environ['XDG_MENU_PREFIX'] + 'applications.menu'):
+    def __init__(self, name=os.environ.get('XDG_MENU_PREFIX', '') + 'applications.menu'):
         self.name = name
 
         self.tree = GMenu.Tree.new(name, GMenu.TreeFlags.SHOW_EMPTY|GMenu.TreeFlags.INCLUDE_EXCLUDED|GMenu.TreeFlags.INCLUDE_NODISPLAY|GMenu.TreeFlags.SHOW_ALL_SEPARATORS|GMenu.TreeFlags.SORT_DISPLAY_NAME)