*to* validator for SmsParams does not work

[DarkSnowCat]

Hi everybody,

looks like the validate method for the to field of the SmsParams does not recognize when the passed target numbers are an empty string. to(): method of SmsRules is checking for a string and not for an array as far as I can see.

// Setting up and testing params
$smsParams = new SmsParams($message, '');
$smsResource->validate($smsParams);

Should throw an exception?

Greetins Michael