Fix printing namespaces with hoisted literals

These bindings do not have a name to sort by, so use their value instead.

Author: dflook

test/helpers.py

@@ -43,7 +43,7 @@ def namespace_name(node):
     for name in sorted(namespace.nonlocal_names):
         s += indent + '  - nonlocal ' + name + '\n'
 
-    for binding in sorted(namespace.bindings, key=lambda b: b.name):
+    for binding in sorted(namespace.bindings, key=lambda b: b.name or str(b.value)):
         s += indent + '  - ' + repr(binding) + '\n'
 
     for child in iter_child_namespaces(namespace):