Cosmos-sdk: "gaiacli query distr slashes" panic

[wlsaud619]

Summary of Bug

Steps to Reproduce

gaiacli query distr slashes cosmosvaloper1lcx36uuxnufkhadv2vx3hv96cn9qfhs2wpsh9q 2 50 --chain-id=J

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For Admin Use

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[alexanderbez]

Thanks for the report @wlsaud619!

/cc @jackzampolin (I can tackle this if you so wish)