[#3573] Use SafeString for default values

src/openforms/registrations/contrib/objects_api/templatetags/registrations/contrib/objects_api/json_tags.py

@@ -20,10 +20,10 @@ def uploaded_attachment_urls(context: template.Context) -> SafeString:
 
 
 @register.simple_tag(takes_context=True)
-def json_summary(context: template.Context) -> SafeString | dict:
+def json_summary(context: template.Context) -> SafeString:
     submission = context.get("_submission")
     if not submission:
-        return {}
+        return SafeString({})
 
     json_data = render_json(submission)
 
@@ -34,14 +34,14 @@ def json_summary(context: template.Context) -> SafeString | dict:
 
 
 @register.simple_tag
-def as_geo_json(value: list[float] | str) -> SafeString | dict:
+def as_geo_json(value: list[float] | str) -> SafeString:
     """Output the ``value`` as a safe GeoJSON dumped string.
 
     As of today, this only supports coordinates. This essentially does the same thing as
     :func:`_transform_coordinates`, but for any map component.
     """
     if not value:
-        return {}
+        return SafeString({})
     data = {"type": "Point", "coordinates": [value[0], value[1]]}
 
     return SafeString(json.dumps(data))