public void setLogoutLogicIfUndefined(final LogoutLogic logoutLogic) {
        if (this.logoutLogic == null) {
            setLogoutLogic(logoutLogic);
        }
    }
<p>setLogoutLogicIfUndefined.</p>

@param logoutLogic a {@link LogoutLogic} object
pac4j-core/src/main/java/org/pac4j/core/config/Config.java