invalid hex address on empty input array

[ypcat]

Hi,

I found when calling contract from cli with empty array input would cause this error:

ERROR: Error calling constant function: invalid hex address:

I think the root cause should be that strings.Split on empty string results in a slice with one empty string ([""]) instead of 0-length ([]).

web3/web3.go

Lines 462 to 469 in c84726a

	case abi.SliceTy, abi.ArrayTy:
	s, ok := param.(string)
	if !ok {
	return nil, fmt.Errorf("invalid array: %s", s)
	}
	s = strings.TrimPrefix(s, "[")
	s = strings.TrimSuffix(s, "]")
	inputArray := strings.Split(s, ",")

I can submit a PR if needed.

Thanks.

[treeder]

PR welcome.

[ypcat]

Sent PR at #295