early returns for none handoff

Author: srest2021

src/sentry/seer/autofix/on_completion_hook.py

@@ -522,7 +522,7 @@ def _clear_handoff_preference(
                 )
                 return
 
-        if not preference:
+        if not preference or preference.automation_handoff is None:
             return
 
         updated_preference = preference.copy(update={"automation_handoff": None})

src/sentry/seer/endpoints/seer_rpc.py

@@ -627,7 +627,7 @@ def trigger_coding_agent_launch(
                 else:
                     preference = get_project_seer_preferences(project.id).preference
 
-                if preference:
+                if preference and preference.automation_handoff is not None:
                     updated_preference = preference.copy(update={"automation_handoff": None})
                     resolved_preference = resolve_repository_ids(
                         organization.id, [SeerProjectPreference.validate(updated_preference)]