Update app.py

app.py

@@ -8,6 +8,12 @@ JS_FUNC1 = os.getenv("JS_FUNC1")
 JS_FUNC2 = os.getenv("JS_FUNC2")
 
 def detect(image):
+    try:
+        file_1 = handle_file(image)
+    except Exception as e:
+        gr.Info("Please upload an image file.")
+        return "", "", ""
+
     result_text = backend.predict(
         image=handle_file(image),
         api_name="/detect"