Revert validate_empty_session. Because it's trash.
Checking in changes prior to tagging of version 0.04.

Changelog diff is:

diff --git a/Changes b/Changes
index 2e88dcb..5b714db 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension HTTP-Session2

 {{$NEXT}}

+0.04 2013-11-01T01:00:09Z
+
+    - Revert validate_empty_session flag introduced at 0.03.
+      (tokuhirom)
+
 0.03 2013-10-31T01:19:19Z

     - Validate empty session option for P3P cookies.