[hal_json] Improve support for rendering Forms in callDialogMethod by inspecting the meta_type

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

@@ -268,9 +268,19 @@ if True:
 
   # RJS: If skin selection is different than Hal* then ERP5Document_getHateoas
   # does not exist and we call form method directly
+  # If update_method was clicked and the target is the original dialog form then we must not call dialog_form directly because it returns HTML
   if clean_kw.get("portal_skin", context.getPortalObject().portal_skins.getDefaultSkin()) not in ("Hal", "HalRestricted"):
     return dialog_form(**kw)
 
+  # dialog_form can be anything from a pure python function, class method to ERP5 Form or Python Script
+  try:
+    meta_type = dialog_form.meta_type
+  except AttributeError:
+    meta_type = ""
+
+  if meta_type == "ERP5 Form":
     return context.ERP5Document_getHateoas(REQUEST=request, form=dialog_form, mode="form")
 
+  return dialog_form(**kw)
+
 return getattr(context, dialog_method)(**kw)