[FIX] point_of_sale: prevent traceback while name of coins/bill is string

When we input some string in many2many field under Coins/Bills in configuration
setting of point of sale module . it will give an error with the message -

'could not convert string to float'

Steps to Produce:-

1. Go to Point of Sale then configuration
2. click on 'Settings'
3. Under 'Payment' input some string in Coins/Bills

Trace-back will be generated.

Reason -
The 'name_create' method of the 'pos_bill' model generates an error when a
string is provided as input for the 'name' field, since the expression
'float(name)' is unable to convert a string to a float.

Applying these changes will resolve this issue.

Sentry - 4122478677

closes odoo/odoo#120207

Signed-off-by: Joseph Caburnay (jcb) <jcb@odoo.com>

addons/point_of_sale/i18n/point_of_sale.pot

@@ -6140,6 +6140,13 @@ msgid ""
 "                        Please contact your manager to accept the closing difference."
 msgstr ""
 
+#. module: point_of_sale
+#. odoo-python
+#: code:addons/point_of_sale/models/pos_bill.py:0
+#, python-format
+msgid "The name of the Coins/Bills must be a number."
+msgstr ""
+
 #. module: point_of_sale
 #: model:ir.model.constraint,message:point_of_sale.constraint_pos_session_uniq_name
 msgid "The name of this POS Session must be unique !"

addons/point_of_sale/models/pos_bill.py

-from odoo import api, fields, models
+from odoo import api, fields, models, _
+from odoo.exceptions import UserError
 
 
 class Bill(models.Model):
@@ -12,5 +13,9 @@ class Bill(models.Model):
 
     @api.model
     def name_create(self, name):
-        result = super().create({"name": name, "value": float(name)})
+        try:
+            value = float(name)
+        except:
+            raise UserError(_("The name of the Coins/Bills must be a number."))
+        result = super().create({"name": name, "value": value})
         return result.name_get()[0]