[cli, contractkit] releasegold:show, account:show broken when no signer set

[timmoreton]

Expected Behavior

celocli releasegold:show and celocli account:show complete successfully and lists contract address under vote,validator,attestation signer when account not registered, or no matching signer registered.

getAccountSummary also now fails in these settings -- what changed?

Current Behavior

• Hits requires on https://github.com/celo-org/celo-monorepo/blob/master/packages/protocol/contracts/common/Accounts.sol#L405
• Error: Your request got reverted with the following reason string: Unknown account

[medhakothari]

I believe #7098 & #7092 both close this issue