HOTFIX: Fix /search and /voice-search error handling

Author: amiraliemami

core_backend/app/question_answer/routers.py

@@ -143,10 +143,10 @@ async def search(
         asession=asession,
     )
 
-    if isinstance(response, QueryResponse):
+    if type(response) is QueryResponse:
         return response
 
-    if isinstance(response, QueryResponseError):
+    if type(response) is QueryResponseError:
         return JSONResponse(
             status_code=status.HTTP_400_BAD_REQUEST, content=response.model_dump()
         )
@@ -259,10 +259,10 @@ async def voice_search(
             os.remove(file_path)
             file_stream.close()
 
-        if isinstance(response, QueryAudioResponse):
+        if type(response) is QueryAudioResponse:
             return response
 
-        if isinstance(response, QueryResponseError):
+        if type(response) is QueryResponseError:
             return JSONResponse(
                 status_code=status.HTTP_400_BAD_REQUEST, content=response.model_dump()
             )