Ignore non-exist object folder when removing a region

Author: jt2594838

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/DataRegion.java

@@ -2307,6 +2307,10 @@ private void deleteAllSGFolders(List<String> folder) {
   private void deleteAllObjectFiles(List<String> folders) {
     for (String objectFolder : folders) {
       File dataRegionObjectFolder = fsFactory.getFile(objectFolder, dataRegionIdString);
+      if (!dataRegionObjectFolder.exists()) {
+        continue;
+      }
+
       AtomicLong totalSize = new AtomicLong(0);
       AtomicInteger count = new AtomicInteger(0);
       try (Stream<Path> paths = Files.walk(dataRegionObjectFolder.toPath())) {