Update app.py

app.py

@@ -42,7 +42,7 @@ def extract_text_from_url(url):
 def extract_entities_and_relationships(text):
     """Use Mistral to extract entities and relationships from text."""
     
-    if not client.api_key:
+    if not os.environ.get("HF_TOKEN"):
         return {
             "entities": [],
             "relationships": [],