clean up design

app.py

@@ -36,7 +36,7 @@ def matches_prefilters(doc, require_has_math: bool | None, require_has_infobox:
     meta = doc.metadata or {}
     if require_has_math and not bool(meta.get("has_math")):
         return False
-    if require_has_infobox and meta.get("infoboxes", "[]") != "[]":
+    if require_has_infobox and meta.get("infoboxes", "[]") == "[]":
         return False
     return True