hal_json_style: remove useless log in Base_callDialogMethod

for same reason as the xhtml_style version, there is no problem with
having more than one listbox, see d2dedca3 (core: remove useless log
in Base_callDialogMethod, 2020-07-03)

bt5/erp5_hal_json_style/SkinTemplateItem/portal_skins/erp5_hal_json_style/Base_callDialogMethod.py

@@ -12,7 +12,6 @@ There are runtime values hidden in every dialog form (injected by getHateoas Scr
   extra_param_json - JSON serialized extra parameters for the dialog script
 """
 
-from erp5.component.module.Log import log, WARNING
 from Products.Formulator.Errors import FormValidationError
 import json
 import six
@@ -180,10 +179,6 @@ for field in form.get_fields():
 
 
 if len(listbox_id_list):
-  # Warn if there are more than one listbox in form ...
-  if len(listbox_id_list) > 1:
-    log('Base_callDialogMethod', 'There are %s listboxes in form %s.' % (len(listbox_id_list), form.id))
-  # ... but handle them anyway.
   for listbox_id in listbox_id_list:
     listbox_line_list = []
     listbox = kw[listbox_id]