protected boolean isLogoutActionBuilderUndefined() {
        return this.logoutActionBuilder == null || this.logoutActionBuilder == NoLogoutActionBuilder.INSTANCE;
    }
<p>setLogoutActionBuilderIfUndefined.</p>

@param logoutActionBuilder a {@link LogoutActionBuilder} object
pac4j-core/src/main/java/org/pac4j/core/client/IndirectClient.java