Issue #7111: Python can now be run without a stdin, stdout or stderr stream.

It was already the case with Python 2.  However, the corresponding
sys module entries are now set to None (instead of an unusable file object).
diff --git a/Misc/NEWS b/Misc/NEWS
index 3041a73..f79e57a 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,10 @@
 Core and Builtins
 -----------------
 
+- Issue #7111: Python can now be run without a stdin, stdout or stderr
+  stream.  It was already the case with Python 2.  However, the corresponding
+  sys module entries are now set to None (instead of an unusable file object).
+
 - Issue #13436: Fix a bogus error message when an AST object was passed
   an invalid integer value.