minor fix

__init__.py

@@ -1,8 +1,8 @@
 # The COPYRIGHT file at the top level of this repository contains the full
 # copyright notices and license terms.
 from trytond.pool import Pool
-import sale
-import dash
+from . import sale
+from . import dash
 
 
 def register():

dash.py

@@ -2,8 +2,6 @@
 # this repository contains the full copyright notices and license terms.
 from trytond.pool import PoolMeta
 
-__all__ = ['DashApp']
-
 
 class DashApp(metaclass=PoolMeta):
     __name__ = 'dash.app'

sale.py

@@ -10,8 +10,6 @@ from trytond.pool import Pool, PoolMeta
 from trytond.transaction import Transaction
 from trytond.model import ModelView, ModelSQL, fields
 
-__all__ = ['Sale', 'AppDelivery', 'AppSaleOrder']
-
 
 class Sale(metaclass=PoolMeta):
     __name__ = 'sale.sale'