Currently an empty line item returns an error validation message as so:
"Line items is too short (minimum is 1 characters)". Kind of confusing
with the "characters" reference. I made the message more
clear. Moreover, I created a module where reusable validations can find a home.
Add Validator module
Merge pull request #118 from minimul/line-err-msg

Currently an empty line item returns an error validation message as so: