Check it's an SSL request before dereferencing the ssl field of a connection

Note the comment in the test file about the difficulty of integrating a meaningful and automatic regression test in the testsuite.

Fix issue #26 (closed)

t/no_ssl.t

@@ -12,7 +12,7 @@ __DATA__
     server {
         error_log logs/error.log debug;
         listen 8443;
-	location = / {
+        location = / {
             default_type text/plain;
             echo $voms_user;
         }