Merge pull request #288 from pyiron/working-directory-none

Fix bug when working directory is None

pysqa/utils/basic.py

@@ -162,7 +162,7 @@ def submit_job(
         Returns:
             int:
         """
-        if " " in working_directory:
+        if working_directory is not None and " " in working_directory:
             raise ValueError(
                 "Whitespaces in the working_directory name are not supported!"
             )