Fix test cases for doctest.
diff --git a/Lib/doctest.py b/Lib/doctest.py
index 5b00ec5..6244fae 100644
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -2476,6 +2476,7 @@
           blah
        #
        #     Ho hum
+       <BLANKLINE>
        """
     output = []
     for piece in DocTestParser().parse(s):