Applying policies to minimize panic

[dongsam]

Summary

Due to the nature of the blockchain, if there is a panic, the chain will stop. As such, panic should only be for non-recoverable errors, and if it is reversible like msg_server level or can fall into an exceptional case due to other module dependencies, I think it is better to process and errors with revert rather than panic.

It was also mentioned in the Cosmos-cash team's review, and all panic and error handling needs to be reconsidered.

Tasks

• DecreaseTotalStakings
• DecreaseOutstandingRewards
• ...

References

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