[auto/python] - Fix a bug in printing stack. (#8032)

CHANGELOG_PENDING.md

@@ -1,3 +1,6 @@
 ### Improvements
 
 ### Bug Fixes
+
+- [automation/python] Fix a bug in printing `Stack` if no program is provided.
+  [#8032](https://github.com/pulumi/pulumi/pull/8032)

sdk/python/lib/pulumi/automation/_local_workspace.py

@@ -101,7 +101,8 @@ class LocalWorkspace(Workspace):
                 self.save_stack_settings(key, stack_settings[key])
 
     def __repr__(self):
-        return f"{self.__class__.__name__}(work_dir={self.work_dir!r}, program={self.program.__name__}, " \
+        return f"{self.__class__.__name__}(work_dir={self.work_dir!r}, " \
+               f"program={self.program.__name__ if self.program else None}, " \
                f"pulumi_home={self.pulumi_home!r}, env_vars={self.env_vars!r}, " \
                f"secrets_provider={self.secrets_provider})"
 

sdk/python/lib/test/automation/test_local_workspace.py

@@ -327,6 +327,7 @@ class TestLocalWorkspace(unittest.TestCase):
         stack_name = stack_namer(project_name)
         work_dir = test_path("data", project_name)
         stack = create_stack(stack_name, work_dir=work_dir)
+        self.assertIsNone(print(stack))
 
         config: ConfigMap = {
             "bar": ConfigValue(value="abc"),