fixed error if cuda not avail

app.py

@@ -6,9 +6,11 @@ from plotly import graph_objects as go
 from overview import NQDOverview
 
 import torch
-print(f"Is CUDA available: {torch.cuda.is_available()}")
-# True
-print(f"CUDA device: {torch.cuda.get_device_name(torch.cuda.current_device())}")
+
+cuda_available = torch.cuda.is_available()
+print(f"Is CUDA available: {cuda_available}")
+if cuda_available:
+    print(f"CUDA device: {torch.cuda.get_device_name(torch.cuda.current_device())}")
 
 # Function to load and cache models
 @st.experimental_singleton(show_spinner=False)