Handle unmarshalling failures gracefully in x/stake commands

PENDING.md

@@ -95,3 +95,4 @@ BUG FIXES
 *  \#1787 Fixed bug where Tally fails due to revoked/unbonding validator
 *  \#1787 Fixed bug where Tally fails due to revoked/unbonding validator
 * [basecoin] Fixes coin transaction failure and account query [discussion](https://forum.cosmos.network/t/unmarshalbinarybare-expected-to-read-prefix-bytes-75fbfab8-since-it-is-registered-concrete-but-got-0a141dfa/664/6)
+* [cli] Handle panics gracefully when `gaiacli stake {delegation,unbond}` fail to unmarshal delegation.

x/stake/client/cli/query.go

@@ -3,6 +3,7 @@ package cli
 import (
 	"fmt"
 
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 	"github.com/tendermint/tendermint/libs/cli"
@@ -139,7 +140,10 @@ func GetCmdQueryDelegation(storeName string, cdc *wire.Codec) *cobra.Command {
 			}
 
 			// parse out the delegation
-			delegation := types.MustUnmarshalDelegation(cdc, key, res)
+			delegation, err := types.UnmarshalDelegation(cdc, key, res)
+			if err != nil {
+				return errors.Errorf("cannot unmarshal delegation: %v", err)
+			}
 
 			switch viper.Get(cli.OutputFlag) {
 			case "text":

x/stake/client/cli/tx.go

@@ -273,11 +273,12 @@ func getShares(
 		if err != nil {
 			return sharesAmount, errors.Errorf("cannot find delegation to determine percent Error: %v", err)
 		}
-
-		delegation := types.MustUnmarshalDelegation(cdc, key, resQuery)
+		delegation, err := types.UnmarshalDelegation(cdc, key, resQuery)
+		if err != nil {
+			return sdk.ZeroRat(), errors.Errorf("cannot unmarshal delegation: %v", err)
+		}
 		sharesAmount = sharesPercent.Mul(delegation.Shares)
 	}
-
 	return
 }