break;
default:
years = Collections.emptyList();
}
for (Integer year : years) {
EctsInstitutionByCurricularYearConversionTable table =
EctsTableIndex.readOrCreateByYear(filter.getExecutionInterval()).getEnrolmentTableBy(ist,
CurricularYear.readByYear(year), cycle);
if (table != null) {
tables.add(table);
} else {