message: Use right semantics to check for undefined var
  - We currently use the wrong comparator to check whether
  a keynonce is undefined. This could lead to the wrong
  keynonces to beUse right semantics to check for undefined var
  - This was introduced in
  Ticket:
diff: @@ -522,7 +522,8 @@ export class Eth extends BaseCoin {
  const ethTxParams = {
  to: params.walletContractAddress,
  - nonce: params.signingKeyNonce || params.txPrebuild.halfSigned.backupKeyNonce,
  + nonce:
  + params.signingKeyNonce !== undefined ? params.signingKeyNonce : params.txPrebuild.halfSigned.backupKeyNonce,
  value: 0,
  gasPrice: new optionalDeps.ethUtil.BN(txPrebuild.gasPrice),
  gasLimit: new optionalDeps.ethUtil.BN(txPrebuild.gasLimit),
  