return 404 where it makes sense

app/routes/posts.py

@@ -71,7 +71,8 @@ def update_post(post_id, new_content, markup_language='babycode'):
 def delete(post_id):
     post = Posts.find({'id': post_id})
     if not post:
-        return redirect(url_for('topics.all_topics'))
+        abort(404)
+        return
 
     thread = Threads.find({'id': post.thread_id})
     user = get_active_user()
@@ -103,13 +104,15 @@ def delete(post_id):
 def edit(post_id):
     post = Posts.find({'id': post_id})
     if not post:
-        return redirect(url_for('topics.all_topics'))
+        abort(404)
+        return
 
     user = get_active_user()
     q = f"{Posts.FULL_POSTS_QUERY} WHERE posts.id = ?"
     editing_post = db.fetch_one(q, post_id)
     if not editing_post:
-        return redirect(url_for('topics.all_topics'))
+        abort(404)
+        return
     if editing_post['user_id'] != user.id:
         return redirect(url_for('topics.all_topics'))
 
@@ -136,7 +139,8 @@ def edit_form(post_id):
     user = get_active_user()
     post = Posts.find({'id': post_id})
     if not post:
-        return redirect(url_for('topics.all_topics'))
+        abort(404)
+        return
     if post.user_id != user.id:
         return redirect(url_for('topics.all_topics'))