* @param groupName the name of the group to search for
     * @return an optional containing the sAMAccountName if found, empty otherwise
     */
    protected OptionalEntity<String> getSAMAccountGroupName(final String bindDn, final String groupName) {
        // Add defensive null/blank checks
        if (StringUtil.isBlank(bindDn) || StringUtil.isBlank(groupName)) {
            if (logger.isDebugEnabled()) {

							</sources>
						</mapping>
						<mapping>
							<directory>${packaging.fess.var.dir}</directory>
							<filemode>755</filemode>
							<username>${packaging.fess.user}</username>
							<groupname>${packaging.fess.group}</groupname>
						</mapping>
						<!-- bin -->
						<mapping>
							<directory>${packaging.fess.bin.dir}</directory>
							<filemode>755</filemode>
							<sources>
								<source>