Update app.py

app.py

@@ -49,7 +49,7 @@ if f is not None:
             st.write(pred)
             pred = np.argmax(pred)
             pred = array[pred]
-            if out[-1] != pred:
+            if not out or out[-1] != pred:
                 out = out + pred
 
         # Increment the frame counter