[4.x] Throw 404 exception on Taxonomy Term Entries endpoint when term…

… doesn't exist (#9273)

Throw 404 exception on Taxonomy Term Entries endpoint when term doesn't exist

src/Http/Controllers/API/TaxonomyTermEntriesController.php

@@ -4,6 +4,7 @@
 
 use Facades\Statamic\API\FilterAuthorizer;
 use Facades\Statamic\API\ResourceAuthorizer;
+use Statamic\Exceptions\NotFoundHttpException;
 use Statamic\Facades\Collection;
 use Statamic\Facades\Term;
 use Statamic\Http\Resources\API\EntryResource;
@@ -32,6 +33,8 @@ public function index($taxonomy, $term)
 
         $term = Term::find($taxonomy.'::'.$term);
 
+        throw_unless($term, new NotFoundHttpException);
+
         $query = $term->queryEntries();
 
         $this->allowedCollections = $this->allowedCollections();