Fixing this is easy:
=== modified file 'UpdateManager/UpdatesAvailable.py'
--- UpdateManager/UpdatesAvailable.py   2012-10-03 15:16:01 +0000
+++ UpdateManager/UpdatesAvailable.py   2012-10-10 08:06:24 +0000
@@ -715,7 +715,7 @@
                 if not pkg.is_installed:
                     name += _(" (New install)")
                 summary = xml.sax.saxutils.escape(getattr(pkg.candidate,
-                                                          "summary", None))
+                                                          "summary", ""))
                 if self.summary_before_name:
                     contents = "%s\n<small>%s</small>" % (summary, name)
                 else:


Its a bit puzling that summary is empty though.

** Visibility changed to: Public

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https://bugs.launchpad.net/bugs/1044080

Title:
  update-manager crashed with AttributeError in escape(): 'NoneType'
  object has no attribute 'replace'

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