Minimal validation on post summary

utils.py

@@ -538,8 +538,14 @@ def get_summary_from_post(post_json_object: {}, system_language: str,
     """Returns the summary from the post in the given language
     including searching for a matching entry within summaryMap
     """
-    return get_content_from_post(post_json_object, system_language,
+    summary_str = \
+        get_content_from_post(post_json_object, system_language,
                               languages_understood, "summary")
+    if summary_str:
+        summary_str = summary_str.strip()
+        if len(summary_str) < 2:
+            summary_str = ''
+    return summary_str
 
 
 def get_base_content_from_post(post_json_object: {},

webapp_post.py

@@ -2713,6 +2713,7 @@ def individual_post_as_html(signing_priv_key_pem: str,
 
     post_is_sensitive = False
     if post_json_object['object'].get('sensitive'):
+        if isinstance(post_json_object['object']['sensitive'], bool):
             # sensitive posts should have a summary
             if post_json_object['object'].get('summary'):
                 post_is_sensitive = post_json_object['object']['sensitive']
@@ -2885,6 +2886,7 @@ def individual_post_as_html(signing_priv_key_pem: str,
         post_id = 'post' + str(create_password(8))
         content_str = ''
         if summary_str:
+            # set the content warning
             cw_str = \
                 add_emoji_to_display_name(session, base_dir, http_prefix,
                                           nickname, domain,