warn when call in replaces header is not found

kamailio/fast-pickup-role.cfg

@@ -48,6 +48,7 @@ route[FAST_PICKUP_ATTEMPT]
                 route(EXTERNAL_TO_INTERNAL_RELAY);
                 exit();
            } else {
+                xlog("L_WARN", "$ci|log|call-id $var(replaced_call_id) not found in cluster, proceeding with normal dispatch\n");
                 remove_hf_re("^Replaces");
            }
        } else {