[hamster-applet] don't die if category is missing

[Toms Baugis <tbaugis src gnome org>]

commit 85bc6aef51c3a58cd2c6be3b4e41541ba57f3bd9
Author: Toms Bauģis <toms baugis gmail com>
Date:   Tue Jan 19 13:11:19 2010 +0000

    don't die if category is missing

 hamster/applet.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/hamster/applet.py b/hamster/applet.py
index 93d0f72..2caebba 100755
--- a/hamster/applet.py
+++ b/hamster/applet.py
@@ -642,7 +642,7 @@ class HamsterApplet(object):
         # check if maybe there is no need to switch, as field match:
         if self.last_activity and \
            self.last_activity['name'].lower() == activity['name'].lower() and \
-           self.last_activity['category'].lower() == activity['category'].lower() and \
+           (self.last_activity['category'] or "").lower() == (activity['category'] or "").lower() and \
            ", ".join(self.last_activity['tags']).lower() == ", ".join(activity['tags']).lower():
             return