# HG changeset patch
# User Björn Ricks <bjoern.ricks@intevation.de>
# Date 1306322998 -7200
# Node ID a70e7f3819223a32ac4ac9eebc95718d53944fc4
# Parent  f0e4637ad4e4e793ec16367ad30eabe8862e3c31
Only update the focus of a List if it has some rows.

This fixes a chash while switching to an empty entry list

diff -r f0e4637ad4e4 -r a70e7f381922 getan/view.py
--- a/getan/view.py	Wed May 25 13:27:42 2011 +0200
+++ b/getan/view.py	Wed May 25 13:29:58 2011 +0200
@@ -41,13 +41,14 @@
         self.frame.set_header(self.header)
 
     def update_focus(self, focus, unfocus=-1):
-        self.focused = focus
-        if focus >= 0 and focus <= len(self.rows)-1:
-            self.rows[focus].focus = True
-            self.rows[focus].update_w()
-        if unfocus >= 0:
-            self.rows[unfocus].focus = False
-            self.rows[unfocus].update_w()
+        if self.rows:
+            self.focused = focus
+            if focus >= 0 and focus <= len(self.rows)-1:
+                self.rows[focus].focus = True
+                self.rows[focus].update_w()
+            if unfocus >= 0:
+                self.rows[unfocus].focus = False
+                self.rows[unfocus].update_w()
         if self.size:
             self.validate_view()