Fix flake8

tests/__init__.py

@@ -2,3 +2,5 @@
 #this repository contains the full copyright notices and license terms.
 
 from .test_product import suite
+
+__all__ = ['suite']

uom.py

@@ -75,8 +75,8 @@ class Uom(ModelSQL, ModelView):
                 'change_uom_rate': ('If the UOM is still not used, you can '
                     'delete it otherwise you can deactivate it '
                     'and create a new one.'),
-                'invalid_factor_and_rate': ('Invalid Factor and Rate values in '
-                    'UOM "%s".'),
+                'invalid_factor_and_rate': (
+                    'Invalid Factor and Rate values in UOM "%s".'),
                 })
 
     @classmethod