Fix usage of context company

Default value of company should be -1 to get the right cast and an impossible
value.
Replace False by None as other value in "in" clause.

issue3394
review1119002

configuration.py

@@ -11,8 +11,8 @@ class Configuration(ModelSingleton, ModelSQL, ModelView):
     __name__ = 'sale.configuration'
     sale_sequence = fields.Property(fields.Many2One('ir.sequence',
             'Sale Reference Sequence', domain=[
-                ('company', 'in', [Eval('context', {}).get('company', 0),
-                        False]),
+                ('company', 'in',
+                    [Eval('context', {}).get('company', -1), None]),
                 ('code', '=', 'sale.sale'),
                 ], required=True))
     sale_invoice_method = fields.Property(fields.Selection([
@@ -20,12 +20,12 @@ class Configuration(ModelSingleton, ModelSQL, ModelView):
                 ('order', 'On Order Processed'),
                 ('shipment', 'On Shipment Sent')
                 ], 'Sale Invoice Method', states={
-                'required': Bool(Eval('context', {}).get('company', 0)),
+                'required': Bool(Eval('context', {}).get('company')),
                 }))
     sale_shipment_method = fields.Property(fields.Selection([
                 ('manual', 'Manual'),
                 ('order', 'On Order Processed'),
                 ('invoice', 'On Invoice Paid'),
                 ], 'Sale Shipment Method', states={
-                'required': Bool(Eval('context', {}).get('company', 0)),
+                'required': Bool(Eval('context', {}).get('company')),
                 }))

sale.py

@@ -37,7 +37,7 @@ class Sale(Workflow, ModelSQL, ModelView):
             },
         domain=[
             ('id', If(Eval('context', {}).contains('company'), '=', '!='),
-                Eval('context', {}).get('company', 0)),
+                Eval('context', {}).get('company', -1)),
             ],
         depends=['state'], select=True)
     reference = fields.Char('Reference', readonly=True, select=True)