Followup 2636efcd1b,
whenever ruby code was changed locally this would break
module loading, giving an "uninitialized constant
DiscourseAi::Embeddings::EntryPoint::SemanticRelated" error.
Currently we're seeing 500s when related_topics are getting rendered. We should get the topic's category rather than on the array.
```
ActionView::Template::Error (undefined method `category' for [#<Topic id ... ]
```
Martin Brennan
Rafael dos Santos Silva
Natalie Tay