Convert max_tasks_per_child to None when the value is 0

The ProcessPoolExecutor supports only a positive integer or None.

Closes #14349

trytond/trytond/cron.py

@@ -26,7 +26,7 @@ def run(options):
         mp_context=None,
         initializer=initializer,
         initargs=(options.database_names,),
-        max_tasks_per_child=options.maxtasksperchild,
+        max_tasks_per_child=options.maxtasksperchild or None,
         )
     if sys.version_info < (3, 11):
         del executor_options["max_tasks_per_child"]

trytond/trytond/worker.py

@@ -67,7 +67,7 @@ def work(options):
         mp_context=None,
         initializer=initializer,
         initargs=(options.database_names,),
-        max_tasks_per_child=options.maxtasksperchild,
+        max_tasks_per_child=options.maxtasksperchild or None,
         )
     if sys.version_info < (3, 11):
         del executor_options["max_tasks_per_child"]