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diff -up system-config-printer-1.4.5/system-config-printer.py.permission system-config-printer-1.4.5/system-config-printer.py
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--- system-config-printer-1.4.5/system-config-printer.py.permission	2014-07-04 17:02:41.000000000 +0100
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+++ system-config-printer-1.4.5/system-config-printer.py	2014-07-11 17:25:28.027096533 +0100
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@@ -207,11 +207,13 @@ class GUI(GtkGUI):
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         Gtk.Window.set_default_icon_name ('printer')
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         edit_action = 'org.opensuse.cupspkhelper.mechanism.all-edit'
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+        self.edit_permission = None
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         if Polkit:
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-            self.edit_permission = Polkit.Permission.new_sync (edit_action,
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-                                                               None, None)
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-        else:
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-            self.edit_permission = None
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+            try:
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+                self.edit_permission = Polkit.Permission.new_sync (edit_action,
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+                                                                   None, None)
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+            except GLib.GError:
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+                pass # Maybe cups-pk-helper isn't installed.
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         self.unlock_button = Gtk.LockButton ()
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         if self.edit_permission != None: