Update app.py

app.py

@@ -436,7 +436,7 @@ def _get_ocr_characters_to_image(
     face_col = json.loads(face_col)
     faces_detected = []
 
-    if len(raw_faces)>0:
+    if raw_faces != None:
         for f in raw_faces:
             embedding_image = f
             identity = "Desconegut"