Avoid the NPE exception in copy object with x-amz-tagging-directive

Cherry-pick of existing commit.
orig-pr: #17400
orig-commit: abf9e6c
orig-commit-author: yuyang wang <39869597+Jackson-Wang-7@users.noreply.github.com>

			pr-link: #18686
			change-id: cid-db0f6ac83b1f6de7937c17f82911b153fe63155d

core/server/proxy/src/main/java/alluxio/proxy/s3/S3RestServiceHandler.java

@@ -984,6 +984,14 @@ public Response createObjectOrUploadPart(@HeaderParam("Content-MD5") final Strin
             throw new S3Exception("Copying an object to itself invalid.",
                 objectPath, S3ErrorCode.INVALID_REQUEST);
           }
+          // avoid the NPE of status
+          try {
+            if (status == null) {
+              status = userFs.getStatus(new AlluxioURI(copySource));
+            }
+          } catch (Exception e) {
+            throw S3RestUtils.toObjectS3Exception(e, objectPath, auditContext);
+          }
           try (FileInStream in = userFs.openFile(new AlluxioURI(copySource));
                RangeFileInStream ris = RangeFileInStream.Factory.create(in, status.getLength(),
                    s3Range);