Exception when rendering card on a flow expecting an optional Config property. #2191
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Description
A flow with an optional Config property raises an exception when trying to generate a card.
Code to reproduce the issue:
from metaflow import Config, FlowSpec, card, step
class Sample(FlowSpec):
config = Config("config", default=None)
@card
@step
def start(self):
self.next(self.end)
@step
def end(self):
pass
if __name__ == "__main__":
Sample()Pipeline output with the exception text:
2024-12-28 11:53:51.402 [1735404831395269/start/1 (pid 97376)] Task is starting.
2024-12-28 11:53:51.655 [1735404831395269/start/1 (pid 97376)] Card render failed with error :
2024-12-28 11:53:51.793 [1735404831395269/start/1 (pid 97376)]
2024-12-28 11:53:51.793 [1735404831395269/start/1 (pid 97376)] Usage: sample.py [OPTIONS] COMMAND [ARGS]...
2024-12-28 11:53:51.793 [1735404831395269/start/1 (pid 97376)]
2024-12-28 11:53:51.793 [1735404831395269/start/1 (pid 97376)] Error: Could not find configuration 'kv.config' in INFO file
2024-12-28 11:53:51.793 [1735404831395269/start/1 (pid 97376)]
2024-12-28 11:53:51.793 [1735404831395269/start/1 (pid 97376)] Card render failed with error :
2024-12-28 11:53:51.811 [1735404831395269/start/1 (pid 97376)]
2024-12-28 11:53:51.811 [1735404831395269/start/1 (pid 97376)] Usage: sample.py [OPTIONS] COMMAND [ARGS]...
2024-12-28 11:53:51.811 [1735404831395269/start/1 (pid 97376)]
2024-12-28 11:53:51.811 [1735404831395269/start/1 (pid 97376)] Error: Could not find configuration 'kv.config' in INFO file
2024-12-28 11:53:51.811 [1735404831395269/start/1 (pid 97376)]
2024-12-28 11:53:51.812 [1735404831395269/start/1 (pid 97376)] Task finished successfully.
2024-12-28 11:53:51.815 [1735404831395269/end/2 (pid 97382)] Task is starting.
2024-12-28 11:53:51.949 [1735404831395269/end/2 (pid 97382)] Task finished successfully.
2024-12-28 11:53:51.949 Done!
This error doesn't happen if there's a default value specified for the Config. Unfortunately, that's not always possible so there's no obvious workaround at this point.
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