Use wrapper to ensure safe close

nomad/datamodel/context.py

@@ -262,9 +262,6 @@ class Context(MetainfoContext):
         self.archives[url] = archive
         self.urls[archive] = url
 
-    def close(self):
-        pass
-
 
 class ServerContext(Context):
     def __init__(self, upload=None):
@@ -413,19 +410,10 @@ class ServerContext(Context):
         return response.json()['data']
 
     def hdf5_path(self, section: MSection):
-        upload_id, entry_id = self._get_ids(section.m_root(), required=True)
+        _, entry_id = self._get_ids(section.m_root(), required=True)
 
         return self.upload_files.archive_hdf5_location(entry_id)
 
-    def close(self):
-        pass
-
-    def __enter__(self):
-        return self
-
-    def __exit__(self, type, value, traceback):
-        self.close()
-
 
 def _validate_url(url):
     return config.api_url(api='api/v1') if url is None else url