Invoices: Filling in the Address with a space causes an email without an attachment

[dd32]

When using the Invoices plugin, if you fill in the Address field with a space (Indicating "I don't care about the address") it fails to generate an invoice.

The CPT is created as a draft and an email is sent with As requested during your purchase, please find attached an invoice for your tickets to "%s". but has no attachment.

What I expected:

1. Checkout to fail requesting I fill in the required field (or JS trimming the fields client side before validation)
   or
2. Invoice to be created without an Address (I don't see it as a required field, but I can see that it would be in some countries)
   or
3. Email not to be sent (Forcing me to contact the Organisers for one)

I would err on the side of 1 if Camptix does client-side validation, or 2 otherwise.
3 should be implemented regardless, as it's pointless sending a invoice email if no invoice can be attached.