Fix deprecation colors attibute on xml view

product.py

@@ -3,6 +3,7 @@
 # the full copyright notices and license terms.
 from trytond.pool import Pool, PoolMeta
 from trytond.transaction import Transaction
+from trytond.pyson import If, Eval, Less
 
 __all__ = ['Template', 'Product']
 __metaclass__ = PoolMeta
@@ -11,6 +12,11 @@ __metaclass__ = PoolMeta
 class Template:
     __name__ = 'product.template'
 
+    @classmethod
+    def view_attributes(cls):
+        return [('/tree', 'colors',
+                If(Less(Eval('quantity', 1), 1), 'red', 'black'))]
+
     def sum_product(self, name):
         Location = Pool().get('stock.location')
 
@@ -26,6 +32,11 @@ class Template:
 class Product:
     __name__ = 'product.product'
 
+    @classmethod
+    def view_attributes(cls):
+        return [('/tree', 'colors',
+                If(Less(Eval('quantity', 1), 1), 'red', 'black'))]
+
     @classmethod
     def get_quantity(cls, products, name):
         Location = Pool().get('stock.location')

view/product_qty_tree.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!-- This file is part product_qty module for Tryton.
 The COPYRIGHT file at the top level of this repository contains the full copyright notices and license terms. -->
-<tree string="Products" colors="If(Less(Eval('quantity', 1), 1), 'red', 'black')">
+<tree string="Products">
     <field name="rec_name"/>
     <field name="quantity"/>
     <field name="forecast_quantity"/>

view/template_qty_tree.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!-- This file is part product_qty module for Tryton.
 The COPYRIGHT file at the top level of this repository contains the full copyright notices and license terms. -->
-<tree string="Products" colors="If(Less(Eval('quantity', 1), 1), 'red', 'black')">
+<tree string="Products">
     <field name="name"/>
     <field name="list_price"/>
     <field name="cost_price"/>