ValidatorSelectionRewardsCallback expects non-zero rewards

[joe-bowman]

Summary of Bug

The ValidatorSelectionRewardsCallback in x/participation rewards expects non-zero rewards to have been earned in the last epoch, and emits an error if zero response is received. This is atypical, but possible, and should be acceptable.

Expected Behaviour

Callback execution with zero rewards is valid and should be acceptable.

Version

v14.5.-rc2

Steps to Reproduce

Submit a ValidatorSelectionRewardsCallback with a payload containing zero rewards:

icq-provider_1  | ts=2023-12-29T15:51:46.635153648Z caller=run.go:767 worker=flusher chain=rhye-2 msg="Failed to submit; nevermind, we'll try again!" err="rpc error: code = Unknown desc = rpc error: code = Unknown desc = failed to execute message; message index: 4: no delegator rewards [cosmos/[email protected]/baseapp/baseapp.go:809] With gas wanted: '75000000' and gas used: '1218555' : unknown request"

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