cETH underlyingPrice is 0 must be always 1

[achiko]

Get Markets data

curl --request POST \
  --url https://api.thegraph.com/subgraphs/name/graphprotocol/compound-v2 \
  --header 'content-type: application/json' \
  --data '{"query":"{\n  \n  markets {\n    name,\n    underlyingSymbol,\n    underlyingPrice    \n  }\n  \n}\n\n\n"}'

 {
        "name": "Compound Ether",
        "underlyingSymbol": "ETH",
        "underlyingPrice": "0"
   }

cEth "underlyingPrice": "0" 1 ETH is always = 1 ETH and main calculation unit is Ether in compound.

underlyingPrice participates in function totalCollateralValueInEth in compound-subgraph-wrapper https://github.com/graphprotocol/compound-subgraph-wrapper/blob/master/src/index.ts#L136

tokenInEth = collateralFactor * exchangeRate * underlyingPrice;  // always returns 0 when collateral is cEth. 
totalCollateralValueInEth = tokenInEth * cTokenBalance;