minor fix

view/sale_web_channel_form.xml

@@ -2,10 +2,10 @@
 <!-- This file is part sale_shop module for Tryton.
 The COPYRIGHT file at the top level of this repository contains the full copyright notices and license terms. -->
 <form>
-    <label name="name_channel"/>
-    <field name="name_channel"/>
-    <label name="channel"/>
-    <field name="channel"/>
+    <label name="name"/>
+    <field name="name"/>
+    <label name="channel_name"/>
+    <field name="channel_name"/>
     <label name="company"/>
     <field name="company"/>
     <label name="app_id"/>

view/sale_web_channel_tree.xml

@@ -2,8 +2,8 @@
 <!-- This file is part sale_shop module for Tryton.
 The COPYRIGHT file at the top level of this repository contains the full copyright notices and license terms. -->
 <tree >
-    <field name="name_channel"/>
-    <field name="channel"/>
+    <field name="name"/>
+    <field name="channel_name"/>
     <field name="shop"/>
     <field name="redirect_uri"/>
     <field name="access_token"/>

web_channel.py

@@ -18,6 +18,7 @@ STATES = {
     }
 
 CHANNELS = [
+        ('', ''),
         ('mercadolibre', 'Mercado Libre'),
         ('rappi', 'Rappi'),
         ('melhous', 'Melhous'),
@@ -48,12 +49,12 @@ class SaleWebChannel(Workflow, ModelSQL, ModelView):
     'Web Channel'
     __name__ = 'sale.web_channel'
     _rec_name = 'channel_name'
-    name_channel = fields.Char('Name Channel')
-    channel= fields.Selection(CHANNELS, 'Channel', select=True,
+    name = fields.Char('Name Channel')
+    channel_name = fields.Selection(CHANNELS, 'Channel', select=True,
                                     required=True, states=STATES)
     company = fields.Many2One('company.company', 'Company', required=True,
                               states=STATES)
-    shop = fields.Many2One('sale.shop', 'Shop', required=True, domain=[
+    shop = fields.Many2One('sale.shop', 'Shop', domain=[
         ('company', '=', Eval('company'))
     ], states=STATES)
     secret_key = fields.Char('Secret Key', states={