fix: implement recommendations

Author: Yuri Zmytrakov

stac_fastapi/core/stac_fastapi/core/core.py

@@ -745,11 +745,7 @@ async def post_search(
         default_limit = int(os.getenv("STAC_DEFAULT_ITEM_LIMIT", 10))
 
         requested_limit = getattr(search_request, "limit", None)
-
-        if requested_limit is None:
-            limit = default_limit
-        else:
-            limit = requested_limit
+        limit = requested_limit or default_limit
 
         if global_max_limit:
             limit = min(limit, global_max_limit)