Update app.py

app.py

@@ -12,7 +12,9 @@ from pptx import Presentation
 
 
 MODEL_LIST = ["THUDM/glm-4v-9b"]
-HF_TOKEN = os.environ.get("HF_TOKEN", None)
+HF_TOKEN = os.environ.get("HF_TOKEN")
+if HF_TOKEN is None:
+    raise ValueError("HF_TOKEN is not set!")
 MODEL_ID = os.environ.get("MODEL_ID")
 MODEL_NAME = MODEL_ID.split("/")[-1]