Merge pull request #652 from FgForrest/arrayindexoutofbounds-fix

fix: ArrayIndexOutOfBounds error correction

evita_engine/src/main/java/io/evitadb/core/query/extraResult/translator/hierarchyStatistics/producer/HierarchySet.java

@@ -103,6 +103,8 @@ private static List<LevelInfo> sort(@Nonnull List<LevelInfo> result, @Nonnull in
 					it -> it.entity().getPrimaryKey()
 				)
 			);
+		} else if (result.isEmpty()) {
+			return Collections.emptyList();
 		} else {
 			return Collections.singletonList(
 				levelInfoToSort[0]