[14.0] mail_debrand raises error on mass mailing

[Highcooley]

Module

mail_debrand

Describe the bug

When trying to send a mass mailing email (either as test or as a real mass mail) with mail_debrand installed, the following error is raised:

Error:
Odoo Server Error

Traceback (most recent call last):
File "/home/odoo/src/odoo/odoo/addons/base/models/ir_http.py", line 237, in _dispatch
result = request.dispatch()
File "/home/odoo/src/odoo/odoo/http.py", line 683, in dispatch
result = self._call_function(**self.params)
File "/home/odoo/src/odoo/odoo/http.py", line 359, in _call_function
return checked_call(self.db, *args, **kwargs)
File "/home/odoo/src/odoo/odoo/service/model.py", line 94, in wrapper
return f(dbname, *args, **kwargs)
File "/home/odoo/src/odoo/odoo/http.py", line 347, in checked_call
result = self.endpoint(*a, **kw)
File "/home/odoo/src/odoo/odoo/http.py", line 912, in call
return self.method(*args, **kw)
File "/home/odoo/src/odoo/odoo/http.py", line 531, in response_wrap
response = f(*args, **kw)
File "/home/odoo/src/odoo/addons/web/controllers/main.py", line 1398, in call_button
action = self._call_kw(model, method, args, kwargs)
File "/home/odoo/src/odoo/addons/web/controllers/main.py", line 1386, in _call_kw
return call_kw(request.env[model], method, args, kwargs)
File "/home/odoo/src/odoo/odoo/api.py", line 399, in call_kw
result = _call_kw_multi(method, model, args, kwargs)
File "/home/odoo/src/odoo/odoo/api.py", line 386, in _call_kw_multi
result = method(recs, *args, **kwargs)
File "/home/odoo/src/odoo/addons/mass_mailing/wizard/mailing_mailing_test.py", line 34, in send_mail_test
body = self.env['mail.render.mixin']._render_template(body, mailing.mailing_model_real, record.ids, post_process=True)[record.id]
File "/home/odoo/src/user/OCA/social/mail_debrand/models/mail_render_mixin.py", line 88, in _render_template
orginal_rendered[key] = self.remove_href_odoo(orginal_rendered[key])
File "/home/odoo/src/user/OCA/social/mail_debrand/models/mail_render_mixin.py", line 38, in remove_href_odoo
if remove_parent and len(parent.getparent()):
Exception

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/home/odoo/src/odoo/odoo/http.py", line 639, in _handle_exception
return super(JsonRequest, self)._handle_exception(exception)
File "/home/odoo/src/odoo/odoo/http.py", line 315, in _handle_exception
raise exception.with_traceback(None) from new_cause
TypeError: object of type 'NoneType' has no len()

To Reproduce

Affected versions: 14.0.2.2.1

Steps to reproduce the behaviour:

1. install mail_debrand
2. create mass email
3. test send or send to recipients

Expected behaviour
The email should be debranded if needed and sent without raising an error.

Additional context
Odoo 14.0 on Odoo.sh

[github-actions]

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