Cannot create new Application

[ntarocco]

Stacktrace:

ValueError: too many values to unpack (expected 3)
  File "flask/app.py", line 2529, in wsgi_app
    response = self.full_dispatch_request()
  File "flask/app.py", line 1825, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "flask/app.py", line 1823, in full_dispatch_request
    rv = self.dispatch_request()
  File "flask/app.py", line 1799, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
  File "flask_login/utils.py", line 290, in decorated_view
    return current_app.ensure_sync(func)(*args, **kwargs)
  File "invenio_oauth2server/views/settings.py", line 145, in client_new
    return render_template(
  File "flask/templating.py", line 147, in render_template
    return _render(app, template, context)
  File "flask/templating.py", line 130, in _render
    rv = template.render(context)
  File "jinja2/environment.py", line 1304, in render
    self.environment.handle_exception()
  File "jinja2/environment.py", line 939, in handle_exception
    raise rewrite_traceback_stack(source=source)
  File "/usr/local/lib/python3.9/site-packages/invenio_oauth2server/templates/semantic-ui/invenio_oauth2server/settings/client_new.html", line 13, in top-level template code
    {%- from "invenio_oauth2server/settings/_macros.html" import render_field with context %}
  File "/usr/local/lib/python3.9/site-packages/invenio_oauth2server/templates/semantic-ui/invenio_oauth2server/settings/index.html", line 13, in top-level template code
    {%- import "invenio_oauth2server/settings/helpers.html" as helpers with context %}
  File "/usr/local/lib/python3.9/site-packages/invenio_theme/templates/semantic-ui/invenio_theme/page_settings.html", line 15, in top-level template code
    {%- set title = _("Settings") %}
  File "/usr/local/lib/python3.9/site-packages/invenio_app_rdm/theme/templates/semantic-ui/invenio_app_rdm/page.html", line 11, in top-level template code
    {%- extends "invenio_theme/page.html" -%}
  File "/usr/local/lib/python3.9/site-packages/invenio_theme/templates/semantic-ui/invenio_theme/page.html", line 86, in top-level template code
    {%- block body %}
  File "/usr/local/lib/python3.9/site-packages/invenio_theme/templates/semantic-ui/invenio_theme/page.html", line 97, in block 'body'
    {%- block body_inner %}
  File "/usr/local/lib/python3.9/site-packages/invenio_app_rdm/theme/templates/semantic-ui/invenio_app_rdm/page.html", line 21, in block 'body_inner'
    {%- block page_body %}
  File "/usr/local/lib/python3.9/site-packages/invenio_theme/templates/semantic-ui/invenio_theme/page_settings.html", line 51, in block 'page_body'
    {%- block settings_content scoped %}
  File "/usr/local/lib/python3.9/site-packages/invenio_oauth2server/templates/semantic-ui/invenio_oauth2server/settings/client_new.html", line 23, in block 'settings_content'
    {{ render_field(field) }}
  File "jinja2/runtime.py", line 782, in _invoke
    rv = self._func(*arguments)
  File "/usr/local/lib/python3.9/site-packages/invenio_oauth2server/templates/semantic-ui/invenio_oauth2server/settings/_macros.html", line 22, in template
    {{ field(placeholder=_(field.label.text | string), **extras) }}
  File "wtforms/fields/core.py", line 164, in __call__
    return self.meta.render_field(self, kwargs)
  File "wtforms/meta.py", line 64, in render_field
    return field.widget(field, **render_kw)
  File "werkzeug/local.py", line 570, in <lambda>
    __call__ = _ProxyLookup(lambda self, *args, **kwargs: self(*args, **kwargs))
  File "invenio_oauth2server/theme/semantic/form_styling.py", line 29, in __call__
    for val, label, selected in field.iter_choices():

Probably related to pallets-eco/wtforms#816

[utnapischtim]

i think this PR should fix it