Write tree before appending it to other tree

eurostat_to_dbnomics.py

@@ -232,18 +232,17 @@ def convert_sdmx_file(repo, sdmx_file_path, target_dir):
                     repo.create_blob(observations_tsv_str),
                     pygit2.GIT_FILEMODE_BLOB,
                 )
-                dataset_tree_id = dataset_tree_builder.write()
 
                 series_count += 1
 
                 if series_commits_count % 10000 == 0:
+                    dataset_tree_id = dataset_tree_builder.write()
                     provider_tree_builder.insert(
                         dataset_code,
                         dataset_tree_id,
                         pygit2.GIT_FILEMODE_TREE,
                     )
                     provider_tree_id = provider_tree_builder.write()
-
                     series_commit_id = repo.create_commit(
                         "refs/heads/{}".format(current_conversion_branch_name),
                         commit_author,
@@ -269,13 +268,14 @@ def convert_sdmx_file(repo, sdmx_file_path, target_dir):
                 else:
                     series_commits_count += 1
 
+        dataset_tree_id = dataset_tree_builder.write()
         provider_tree_builder.insert(
             dataset_code,
             dataset_tree_id,
             pygit2.GIT_FILEMODE_TREE,
         )
         provider_tree_id = provider_tree_builder.write()
-        series_commit_id = repo.create_commit(
+        repo.create_commit(
             "refs/heads/{}".format(current_conversion_branch_name),
             commit_author,
             commit_author,