- pythunrun.c, Py_Finalize(): move the call to _Py_PrintReferences()

even farther down, to just before the call to
  _PyObject_DebugMallocStats().  This required the following changes:

- pystate.c, PyThreadState_GetDict(): changed not to raise an
  exception or issue a fatal error when no current thread state is
  available, but simply return NULL without raising an exception
  (ever).

- object.c, Py_ReprEnter(): when PyThreadState_GetDict() returns NULL,
  don't raise an exception but return 0.  This means that when
  printing a container that's recursive, printing will go on and on
  and on.  But that shouldn't happen in the case we care about (see
  first bullet).

- Updated Misc/NEWS and Doc/api/init.tex to reflect changes to
  PyThreadState_GetDict() definition.

Python/pystate.c

@@ -266,17 +266,21 @@ PyThreadState_Swap(PyThreadState *new)
 /* An extension mechanism to store arbitrary additional per-thread state.
    PyThreadState_GetDict() returns a dictionary that can be used to hold such
    state; the caller should pick a unique key and store its state there.  If
-   PyThreadState_GetDict() returns NULL, an exception has been raised (most
-   likely MemoryError) and the caller should pass on the exception. */
+   PyThreadState_GetDict() returns NULL, an exception has *not* been raised
+   and the caller should assume no per-thread state is available. */
 
 PyObject *
 PyThreadState_GetDict(void)
 {
 	if (_PyThreadState_Current == NULL)
-		Py_FatalError("PyThreadState_GetDict: no current thread");
+		return NULL;
 
-	if (_PyThreadState_Current->dict == NULL)
-		_PyThreadState_Current->dict = PyDict_New();
+	if (_PyThreadState_Current->dict == NULL) {
+		PyObject *d;
+		_PyThreadState_Current->dict = d = PyDict_New();
+		if (d == NULL)
+			PyErr_Clear();
+	}
 	return _PyThreadState_Current->dict;
 }