Fork Doesn't Set Version By Default (#512)

This better supports the common case of using fork interactively to test
code changes. A version can still be set if desired.

Author: kraftp

dbos/_sys_db.py

@@ -700,11 +700,7 @@ def fork_workflow(
                     name=status["name"],
                     class_name=status["class_name"],
                     config_name=status["config_name"],
-                    application_version=(
-                        application_version
-                        if application_version is not None
-                        else status["app_version"]
-                    ),
+                    application_version=application_version,
                     application_id=status["app_id"],
                     authenticated_user=status["authenticated_user"],
                     authenticated_roles=status["authenticated_roles"],

tests/test_workflow_management.py

@@ -228,7 +228,8 @@ def stepFive(x: int) -> int:
     with SetWorkflowID(fork_id):
         forked_handle = DBOS.fork_workflow(wfid, 3)
     assert forked_handle.workflow_id == fork_id
-    assert forked_handle.get_status().app_version == DBOS.application_version
+    app_version = forked_handle.get_status().app_version
+    assert app_version is None or app_version == DBOS.application_version
     assert forked_handle.get_status().forked_from == wfid
     assert forked_handle.get_result() == output