Issue #1445: Fix a SystemError when accessing the ``cell_contents``
attribute of an empty cell object.  Now a ValueError is raised.

Backport of r59170.
diff --git a/Misc/NEWS b/Misc/NEWS
index c633032..f856c1f 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -1,4 +1,4 @@
-+++++++++++
++++++++++++
 Python News
 +++++++++++
 
@@ -12,6 +12,9 @@
 Core and builtins
 -----------------
 
+- Issue #1445: Fix a SystemError when accessing the ``cell_contents`` 
+  attribute of an empty cell object.
+
 - Issue #1265: Fix a problem with sys.settrace, if the tracing function uses a
   generator expression when at the same time the executed code is closing a
   paused generator.