Request for get-errors to allow for zero args

[mefesto]

noir.validation/errors? allows you to optionally specify a field to determine if there are any associated errors. If you omit the field then it checks all fields. This issue is to request for similar behavior from noir.validation/get-errors.

This would help in the case where you'd like to display all errors messages in a single location instead of next to the associated field.

[ibdknox]

Done in 1.2.2-SNAPSHOT :)