Add tests for bug #478115, parsedate_tz() IndexError when a Date:
field exists with an empty value.
diff --git a/Lib/test/test_rfc822.py b/Lib/test/test_rfc822.py
index ab1746b..cc6e27b 100644
--- a/Lib/test/test_rfc822.py
+++ b/Lib/test/test_rfc822.py
@@ -118,6 +118,14 @@
              ])
 
         self.check(
+            'To: Some One <someone@dom.ain>\n'
+            'From: Anudder Persin <subuddy.else@dom.ain>\n'
+            'Date:\n'
+            '\n'
+            'test',
+            [('Some One', 'someone@dom.ain')])
+
+        self.check(
             'To: person@dom.ain (User J. Person)\n\n',
             [('User J. Person', 'person@dom.ain')])