743 fix invoice date

[tiagonmas]

Description

Not letting users create invoices for past years, if after Jan 15th.

[guerrerotook]

I made small changes in the code to avoid throwing an exception. They expensive from the performance perspective and that is a known case and not something exceptional. What I did is created a InvalidInvoice object that will be returned instead and the caller will handle this invalid invoice showing the page that you created.