MDL -29774 Fix

MDL-29774 Fix clientlib.js

/**
 * Updates the current groups information shown about a user when a user is selected.
 *
 * @global {Array} userSummaries
 *      userSummaries is added to the page via /user/selector/lib.php - group_non_members_selector::print_user_summaries()
 *      as a global that can be used by this function.
 */
function updateUserSummary() {
    var selectEl = document.getElementById('addselect'),
        summaryDiv = document.getElementById('group-usersummary'),
        length = selectEl.length,
        selectCnt = 0,
        selectIdx = -1,
        selectedUID =0,
        i;

    for (i = 0; i < length; i++) {
        if (selectEl.options[i].selected) {
            selectCnt++;
            selectIdx = selectEl.options[i].value;
            
        }
    }

    if (selectCnt == 1 && userSummaries[selectIdx]) {
        summaryDiv.innerHTML = userSummaries[selectIdx];
    } 
    else{
        summaryDiv.innerHTML ='';
    }
    

    return true;
}