Update app.py

app.py

@@ -96,6 +96,7 @@ with tab2:
         Image.open(uploaded_b).save(temp_b)
 
         if st.button("Run Interpolation"):
+            gif_path = None
             gif_path = interpolate_image(temp_a, temp_b)
             st.image(gif_path, caption="Interpolated GIF")
             # Note about visual noise