[FIX]Validated invoice with amount == 0.0 MUST be in account move line

bzr revid: dle@openerp.com-20121221101356-xp6x8a5naehq5z4p

addons/account/account_invoice.py

@@ -870,8 +870,6 @@ class account_invoice(osv.osv):
         if context is None:
             context = {}
         for inv in self.browse(cr, uid, ids, context=context):
-            if inv.amount_total == 0.0:
-                continue
             if not inv.journal_id.sequence_id:
                 raise osv.except_osv(_('Error!'), _('Please define sequence on the journal related to this invoice.'))
             if not inv.invoice_line:
@@ -1055,8 +1053,6 @@ class account_invoice(osv.osv):
         self.write(cr, uid, ids, {})
 
         for obj_inv in self.browse(cr, uid, ids, context=context):
-            if obj_inv.amount_total == 0.0:
-                continue
             id = obj_inv.id
             invtype = obj_inv.type
             number = obj_inv.number