Summary
The user is developing a Google Cloud Storage workflow to check for a file's existence and execute a subworkflow or a no-operation task based on that. They are facing a compilation error related to a required value during workflow registration and are confused about the term "is_none" and handling optional inputs. The user seeks a solution that avoids adding a task that returns a boolean. They note that "is_none" may not work with promises and that the output types of "then" nodes must match. After testing, they found that only boolean outputs work correctly, and using a field from a dataclass or namedtuple in the condition fails. They concluded that unpacking the task's output and using the boolean directly is the only viable solution. The user also mentioned defining a task that returns a tuple with the actual file and a boolean to complete the condition.