[FIX] l10n_it_edi: fix traceback on fetchmail

When the server execute the job 'Mail: Fetchmail Service'
if it's processed an attachment having a Notes field with None values
the following traceback will occur
AttributeError: 'NoneType' object has no attribute 'split'

//IdentificativoSdI','//DataOraRicezione','//Descrizione','//MessageId','//Note'.
seems to be not mandatory

opw-2277722

closes odoo/odoo#54636

X-original-commit: f96be5eb
Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>
Signed-off-by: agr-odoo <agr-odoo@users.noreply.github.com>

addons/l10n_it_edi/models/ir_mail_server.py

@@ -339,8 +339,8 @@ class FetchmailServer(models.Model):
             if not elements:
                 continue
             for element in elements:
-                text = " ".join(element.text.split())
-                if text:
+                if element.text:
+                    text = " ".join(element.text.split())
                     output_str += "<li>%s: %s</li>" % (element.tag, text)
         return output_str + "</ul>"