Remove unused taxes dictionary

purchase.py

@@ -475,7 +475,6 @@ class Purchase(
         self.untaxed_amount = Decimal('0.0')
         self.tax_amount = Decimal('0.0')
         self.total_amount = Decimal('0.0')
-        taxes = {}
         if self.lines:
             for line in self.lines:
                 self.untaxed_amount += getattr(line, 'amount', None) or 0