Correct handling of functions with only kwarg args in getcallargs (closes #11256)

A patch from Daniel Urban.
diff --git a/Misc/NEWS b/Misc/NEWS
index bfb9ff1..3f1bb34 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -49,6 +49,9 @@
 Library
 -------
 
+- Issue #11256: Fix inspect.getcallargs on functions that take only keyword
+  arguments.
+
 - Issue #11696: Fix ID generation in msilib.
 
 - Issue #9696: Fix exception incorrectly raised by xdrlib.Packer.pack_int when