fix(x/protocolpool): fix potential panic and missing error handling

[Halimao]

Description

Refer #18471 changes

Summary

• Fix the order of judging budget.StartTime in InitGenesis
• Addition of handling non-not-found error for getting recipient continuous funds, in case there is an error but continue to the withdraw continuous fund logical

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[coderabbitai]

Walkthrough

The updates involve refining the error handling and validation processes within the ProtocolPool module. Changes were made to ensure that the StartTime for budgets is properly validated during the initialization and cancellation phases of continuous funding. Additionally, the validateContinuousFund method has been enhanced for better functionality, and the error messaging has been improved in the withdrawContinuousFund method to provide clearer feedback when a continuous fund cannot be located.

Changes

Files	Change Summaries
.../keeper/genesis.go, .../keeper/msg_server.go	Modified logic for handling errors and validating StartTime of budgets in the InitGenesis function and CancelContinuousFund function respectively.
.../keeper/keeper.go	Refactored validateContinuousFund method; updated error message in withdrawContinuousFund method for better clarity when a fund is missing.
CHANGELOG.md	Bug fix related to potential panic and error handling in the cosmos-sdk codebase.

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[julienrbrt]

Thank you! We just don't need a changelog.

[Halimao]

Thank you! We just don't need a changelog.

The changelog is reverted now