[FIX] l10n_it_vat_registries - missing body line due to header structure

### Versions
wkhtmltopdf 0.11.0 rc1
7.0 branch at f1bb4c58625d0bee79560b5fc597a9c150d38188
### How to reproduce
Install ```l10n_it_vat_registries```
Create 11 customer invoices with VAT 22%
Print VAT registry for customer invoices
Inoivce 9 is not printed. See

![vat-reg](https://cloud.githubusercontent.com/assets/1033131/3569552/2ba6c3d8-0b41-11e4-901f-bd05c02a2392.png)

### Analysis
I noticed this depends on the presence of ```h1``` and ```h3``` outside the table. So, I reorganized the headers in order to avoid the problem.
See the result

![fixed-vat-reg](https://cloud.githubusercontent.com/assets/1033131/3569607/0d10556e-0b42-11e4-8097-e353e657481b.png)