test(): Avoid a UnboundLocalError when a method is missing from both the string

module and from string methods.

This closes patch "[ #490811 ] Jython and test_string".

Lib/test/test_string.py

@@ -21,6 +21,7 @@ def test(name, input, output, *args):
             value = apply(f, (input,) + args)
     except:
         value = sys.exc_type
+        f = name
     if value != output:
         if verbose:
             print 'no'