docs: function (filterDef) {
                  var filters = this._filters;
                  // stop here if there are no filters
                  if (!filters) {
                      return false;
                  }
                  var isWrongFilter = getFindFilterFunction(filterDef);
                  if (isWrongFilter == null) {
                      this.$logError(this.INVALID_PARAMETER_FOR_ISFILTERPRESENT);
                      clean();
                      return false;
                  }
                  for (var i = 0, l = filters.length; i < l; i++) {
                      if (!isWrongFilter(filters[i])) {
                          clean();
                          return true;
                      }
                  }
                  clean();
                  return false;
              }