non consistent form of withdraw reward json key(value)

[carameleon]

Summary of Bug

When we set validator commission to 100%,
the logs in tx-response have been omitted their value

"key":"amount" has no their value key

commission set 100% (omission value) (tx hash = 0427ADA778454592A5D6ED0CDC1BEA0693E859EC9951FE376138A4936DC03238)

{
  "type": "withdraw_rewards",
  "attributes": [
    {
      "key": "amount"
    },
    {
      "key": "validator",
      "value": "cosmosvaloper1x5wgh6vwye60wv3dtshs9dmqggwfx2ldk5cvqu"
    }
  ]
}

when commission set under 100% (tx hash = A5C34733E253F805466956EE315D8FA9F4D6FB859A9A0C5360A0D1A99A9BFC98)

{
  "type": "withdraw_rewards",
  "attributes": [
    {
      "key": "amount",
      "value": "89007507977umuon"
    },
    {
      "key": "validator",
      "value": "cosmosvaloper1tflk30mq5vgqjdly92kkhhq3raev2hnz6eete3"
    }
  ]
}

I thought it should return the consistent form of tx.

Version

stargate-final, cosmos-sdk 0.41.0

Steps to Reproduce

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