[IMP] stock: Log if a method doesn't exist when running scheduler

Purpose
=======

If a method doesn't exist when running scheduler, log an error instead of raising an AttributeError

The goal of a cron method is to go ad far as possible.

addons/stock/models/procurement.py

@@ -184,7 +184,10 @@ class ProcurementGroup(models.Model):
         if not rule:
             raise UserError(_('No procurement rule found. Please verify the configuration of your routes'))
 
-        getattr(rule, '_run_%s' % rule.action)(product_id, product_qty, product_uom, location_id, name, origin, values)
+        if hasattr(rule, '_run_%s' % rule.action):
+            getattr(rule, '_run_%s' % rule.action)(product_id, product_qty, product_uom, location_id, name, origin, values)
+        else:
+            _logger.error("The method _run_%s doesn't exist on the procument rules" % rule.action)
         return True
 
     @api.model