Check that fields are strings

src/content_labels.py

@@ -514,10 +514,14 @@ def _store_content_labels_base(base_dir: str, nickname: str, domain: str,
     map_links: list[str] = []
     published = None
     if has_object_dict(post_json_object):
-        if 'content' in post_json_object['object']:
+        if 'content' in post_json_object['object'] and \
+           'published' in post_json_object['object']:
             published = post_json_object['object']['published']
             post_content = post_json_object['object']['content']
-            map_links += get_map_links_from_post_content(post_content, session)
+            if isinstance(published, str) and \
+               isinstance(post_content, str):
+                map_links += \
+                    get_map_links_from_post_content(post_content, session)
     # get geolocation from labels
     location_str = get_location_from_post(post_json_object)
     if location_str: