CLI: validator-outstanding-rewards

[alexanderbez]

Summary of Bug

$ gaiacli query distr validator-outstanding-rewards
ERROR: {"codespace":"sdk","code":6,"message":"incorrectly formatted request data; UnmarshalJSON cannot decode empty bytes"} 

The command isn't implemented correctly at all. The command should take as input a validator address and properly create the query params.

Current:

			route := fmt.Sprintf("custom/%s/validator_outstanding_rewards", queryRoute)
			res, err := cliCtx.QueryWithData(route, []byte{})
			if err != nil {
				return err
			}

Should be:

			route := fmt.Sprintf("custom/%s/validator_outstanding_rewards", queryRoute)
			res, err := cliCtx.QueryWithData(route, paramBytes)
			if err != nil {
				return err
			}

We really need to improve our CLI testing....

Version

5f9c3fdf88952ea43316f1a18de572e7ae3c13f6

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