[gnome-tweak-tool] Fix KeyError when extensions with no version installed

[Rui Matos <rtcm src gnome org>]

commit 6c05bebbc835ca589da5e2fb114f7ce4faaa1b50
Author: Petr Kocandrle <pkocandr redhat com>
Date:   Thu May 15 10:59:45 2014 +0200

    Fix KeyError when extensions with no version installed
    
    https://bugzilla.gnome.org/show_bug.cgi?id=730177

 gtweak/tweaks/tweak_group_shell_extensions.py |   17 +++++++++++------
 1 files changed, 11 insertions(+), 6 deletions(-)
---
diff --git a/gtweak/tweaks/tweak_group_shell_extensions.py b/gtweak/tweaks/tweak_group_shell_extensions.py
index d615ea9..6ce2787 100644
--- a/gtweak/tweaks/tweak_group_shell_extensions.py
+++ b/gtweak/tweaks/tweak_group_shell_extensions.py
@@ -25,10 +25,13 @@ def _fix_shell_version_for_ego(version):
     version = '.'.join(version.split('.')[0:3])
     if version[-1] == '0':
         #if it is .0, drop that too
-        return '.'.join(version.split('.')[0:2])
+        return _get_shell_major_minor_version(version)
     else:
         return version
 
+def _get_shell_major_minor_version(version):
+    return '.'.join(version.split('.')[0:2])
+
 class _ShellExtensionTweak(Gtk.ListBoxRow, Tweak):
 
     def __init__(self, shell, ext, **options):
@@ -311,14 +314,16 @@ class ShellExtensionTweakGroup(ListBoxTweakGroup):
             resp = resp['shell_version_map']
             shell = GnomeShellFactory().get_shell()
             version = _fix_shell_version_for_ego(shell.version)
-            try:
+
+            if version in resp:
                 resp = resp[version]
-                if int(resp["version"]) > extension["version"]:
+                ext_version = extension["version"] if "version" in extension else 0
+                if int(resp["version"]) > ext_version:
                     widget.add_update_button(uuid)
-
-            except KeyError:
+            else:
+                ext_version = extension["version"] if "version" in extension else "unknown"
                 logging.info("e.g.o no updates for %s (shell version %s extension version %s)" % (
-                             uuid,version,extension["version"]))
+                             uuid, version, ext_version))
 
     def _list_header_func(self, row, before, user_data):
         if before and not row.get_header():