detect odoo api not initialized so that po_in_process is deleted

reception/models.py

@@ -230,6 +230,9 @@ class CagetteReception(models.Model):
            products are updated with new vendor prices"""
         result = None
 
+        if self.o_api == None:
+            return 'error : cant reach odoo'
+
         res = self.o_api.execute('purchase.order', 'action_view_picking', [self.id])
         new_x_reception_status = ''
         if res: