fix creation of invalid import directory

catalog/citation/management/commands/load_bibtex.py

@@ -4,6 +4,7 @@
 from ... import bibtex as bibtex_api
 
 import logging
+import os
 import pathlib
 import pickle
 
@@ -43,6 +44,7 @@ def process_bibtex_file(self, path, user):
             logger.debug("deleting old invalid_output_file file %s", invalid_output_file)
             invalid_output_file.unlink()
         errors_and_duplicates = bibtex_api.process_entries(path.absolute().as_posix(), user)
+        os.makedirs(str(invalid_output_file.parent.absolute()), exist_ok=True)
         with invalid_output_file.open('wb') as f:
             logger.debug("Pickling duplicate errors to %s", invalid_output_file)
             pickle.dump(errors_and_duplicates, f)