fix(medcat-trainer): Fix Try Model bug after medcat V2

[alhendrickson]

Fixes two issues with the try model page

500 Error on /api/annotate-text/

Error introduced in this PR

https://github.com/CogStack/cogstack-nlp/pull/309/changes

[medcattrainer] AttributeError: 'set' object has no attribute 'check_filters'
[medcattrainer] ERROR 2026-06-10 15:34:57,522 log.py l:253:Internal Server Error: /api/annotate-text/
[medcattrainer] Traceback (most recent call last):
[medcattrainer] File "/home/.venv/lib/python3.12/site-packages/django/core/handlers/exception.py", line 55, in inner
[medcattrainer] response = get_response(request)

...
 
[medcattrai
[medcattrainer] response = handler(request, *args, **kwargs)
[medcattrainer] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[medcattrainer] File "/home/.venv/lib/python3.12/site-packages/rest_framework/decorators.py", line 50, in handler
[medcattrainer] return func(*args, **kwargs)
[medcattrainer] ^^^^^^^^^^^^^^^^^^^^
[medcattrainer] File "/home/api/api/views.py", line 781, in annotate_text
[medcattrainer] spacy_doc = cat(message)
[medcattrainer] ^^^^^^^^^^^^
[medcattrainer] File "/home/.venv/lib/python3.12/site-packages/medcat/cat.py", line 114, in __call__
[medcattrainer] doc = self._pipeline.get_doc(text)
[medcattrainer] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[medcattrainer] File "/home/.venv/lib/python3.12/site-packages/medcat/pipeline/pipeline.py", line 331, in get_doc

No entities returned

Original code then seems to be dependent on each Entity being loaded in already, but it really doesnt have to.

I'm not sure when the Entity table is meant to get loaded, so this is technically a work around, but really it's just simplifying it.

Current flow:

• Get entities from medcat
• Check they are loaded into the Entity database, and return Entity IDs to the UI.
• Filter anything not in the database
• Then in the UI, resolve Entity ID to CUI

New flow

• Get entities from medcat
• As seemingly an unused step - Check they are loaded into the Entity database, and get the Entity ID. Dont filter
• Return CUIs to the UI
• Then in the UI, dont resolve the CUI again

[tomolopolis]

lgtm - nice thanks for picking up this fix