Correctly handle CertificateRequest with empty DN list in <= TLS 1.1

ChangeLog

diff --git a/ChangeLog b/ChangeLog
index c1b6c88..701f86b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -4,6 +4,8 @@
 Bugfix
    * Memory leak when using RSA_PKCS_V21 operations fixed
    * Handle future version properly in ssl_write_certificate_request()
+   * Correctly handle CertificateRequest message in client for <= TLS 1.1
+     without DN list
 
 = Version 1.2.3 released 2012-11-26
 Bugfix