* @return {boolean} Whether the given string is null or is the empty string.
 * @public
 */
Platform.stringIsNullOrEmpty = function(str) {
  return !str;
};


/**
 * @param {?string} str
 * @return {string} Original str, if it is non-null. Otherwise empty string.
 */
Platform.nullToEmpty = function(str) {
  return str || "";
};


/**
 * @param {?string} str

                  $liEle = $("<li/>");
                  $liEle.html(str);
                  $liEle.click(function() {
                    var str = $(this).html();
                    suggestor.fixList();
                    $textArea.val(str);
                    if (typeof $settingSearchForm !== "undefined") {
                      $settingSearchForm.submit();