correct empty line in received-header (#619)

when the 'if' statements at lines 235 and 239 were both false, nothing more was added except another '\n' at line 244.

common/usr/sbin/MSMilter

@@ -233,15 +233,13 @@ sub envrcpt_callback
                 MailScanner::Log::DebugLog("envrcpt_callback: ssl/tls detected");
         }
         if (!defined($symbols->{'H'}->{'{cert_subject}'})) {
-            ${$message_ref} .= "\t(no client certificate requested)";
+            ${$message_ref} .= "\t(no client certificate requested)\n";
             MailScanner::Log::DebugLog("envrcpt_callback: no client certificate requested");
         }
         if (defined($symbols->{'M'}->{'{auth_type}'}) && defined($symbols->{'M'}->{'{auth_authen}'})) {
             ${$message_ref} .= "\t(Authenticated sender)\n";
             MailScanner::Log::DebugLog("envrcpt_callback: Authenticated sender: " . $symbols->{'M'}->{'{auth_authen}'});
             ${$message_ref} = "A<sasl_method=" . $symbols->{'M'}->{'{auth_type}'} . ">\n" . ${$message_ref};
-        } else {
-            ${$message_ref} .= "\n";
         }
         ${$message_ref} .= "\tby " . hostname . ' (MailScanner Milter) with SMTP id ';
     }