Avoid errors when using activity with groups/organizations

[mjanez]

Avoid error

...
File "/srv/app/src_extensions/ckanext-harvest/ckanext/harvest/templates/base.html", line 1, in top-level template code
{% ckan_extends %}
File "/srv/app/src/ckan/ckan/templates/base.html", line 108, in top-level template code
{%- block page %}{% endblock -%}
File "/srv/app/src/ckan/ckan/templates/page.html", line 19, in block 'page'
{%- block content %}
File "/srv/app/src/ckan/ckan/templates/page.html", line 22, in block 'content'
{% block main_content %}
File "/srv/app/src/ckan/ckan/templates/page.html", line 74, in block 'main_content'
{% block primary %}
File "/srv/app/src/ckan/ckan/templates/page.html", line 87, in block 'primary'
{% block primary_content %}
File "/srv/app/src/ckan/ckan/templates/page.html", line 89, in block 'primary_content'
{% block page_header %}
File "/srv/app/src/ckan/ckan/templates/page.html", line 97, in block 'page_header'
{% block content_primary_nav %}{% endblock %}
File "/srv/app/src/ckan/ckanext/activity/templates/organization/read_base.html", line 4, in block 'content_primary_nav'
{{ super() }}
File "/srv/app/src_extensions/ckanext-pages/ckanext/pages/theme/templates_organization/organization/read_base.html", line 6, in block 'content_primary_nav'
{{ h.build_nav_icon('pages.organization_pages_index', _('Pages'), id=c.group_dict.name, icon='file') }}
File "/usr/local/lib/python3.10/site-packages/jinja2/environment.py", line 487, in getattr
return getattr(obj, attribute)
jinja2.exceptions.UndefinedError: 'werkzeug.local.LocalProxy object' has no attribute 'group_dict'