get_section: return undefined value if the key does not exist.
Checking in changes prior to tagging of version 0.11.

Changelog diff is:

diff --git a/Changes b/Changes
index d4ad9ef..d8ecf10 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,12 @@ Revision history for Perl extension Text::TestBase

 {{$NEXT}}

+0.11 2013-06-04T22:31:09Z
+
+    - get_section: return undefined value if the key does not exist.
+      AUTOLOAD: die if the block does not exists.
+      (tokuhirom)
+
 0.10 2013-05-07T05:22:43Z

     - Fixed deps