PDP: error when get-proof-set without a file added to it

[longfeiWan9]

Checklist

• This is not a question or a support request. If you have any Curio related questions, please ask in the discussion forum.
• This is not a new feature request. If it is, please file a feature request instead.
• This is not an enhancement request. If it is, please file a improvement suggestion instead.
• I have searched on the issue tracker and the discussion forum, and there is no existing related issue or discussion.
• I am running the Latest release, or the most recent RC(release candidate) for the upcoming release or the dev branch(master), or have an issue updating to any of these.
• I did not make any code changes to curio.

Curio component

• PoRep Pipeline
• Snap Deals
• Market
• IPNI provider
• Curio UI
• Other

Curio Version

build curio from the main branch.

Describe the Bug

After creating a pdp proofset, I tried to get the information for this proofset before adding a file to it.

But it throws an error instead of returning a proper status. I think it should return something normal even without any files or roots added to this proofset.

Logging Information

./pdptool get-proof-set --service-url https://yablu.net --service-name pdp-longfei 189
error: failed to get proof set, status code 500: Failed to retrieve next challenge epoch: can't scan into dest[0]: cannot scan NULL into *int64

Repo Steps

1. Run ./pdptool create-proof-set ....
2. Then run ./pdptool get-proof-set
3. I will return error error: failed to get proof set, status code 500: Failed to retrieve next challenge epoch: can't scan into dest[0]: cannot scan NULL into *int64