fix issues with testing of parser for ArgParse

tests/test_experiment.py

@@ -12,7 +12,7 @@ def test_start_and_stop_are_logged_with_optparse():
 
 def test_start_and_stop_are_logged_with_argparse():
     statement = (
-        f"python -c 'import cgatcore.experiment as E; options, args = E.start(parser=E.ArgumentParser()); E.stop()'")
+        f"python -c 'import cgatcore.experiment as E; options = E.start(parser=E.ArgumentParser()); E.stop()'")
 
     stdout = E.run(statement, return_stdout=True)
     assert "job started" in stdout