Review feedback round 3

Signed-off-by: Christian Vetter <christian.vetter@here.com>

Author: VeaaC

flatdata-py/flatdata/lib/file_resource_writer.py

@@ -49,4 +49,4 @@ def write(self, data):
     def close(self):
         '''Flush data and close file'''
         self._file.flush()  # type: ignore[union-attr]  # _file is set by open() before close() is called
-        self._file.close()  # type: ignore[union-attr]
+        self._file.close()  # type: ignore[union-attr]  # _file is set by open() before close() is called