Rework LSO interaction

Automatically skip a playbook execution if the inventory is empty to prevent hangs.

gso/services/lso_client.py

@@ -166,7 +166,7 @@ def _inventory_is_set(state: State) -> bool:
         raise ProcessFailureError(msg, details="Key 'inventory' not found in state.")
     if "all" not in state["inventory"] or "hosts" not in state["inventory"]["all"]:
         msg = "Malformed Ansible inventory found in state."
-        raise ProcessFailureError(msg, details=state)
+        raise ProcessFailureError(msg, details="Ansible inventory must be in YAML form, not string.")
 
     return state["inventory"]["all"]["hosts"]