[dfif] elif not png_files: await thread.send('png files are empty.')

app.py

@@ -440,6 +440,8 @@ async def deepfloydif(ctx, *, prompt: str):
                 with open(combined_image_path, 'rb') as f:
                     combined_image_dfif = await thread.send(f'{ctx.author.mention}React with the image number you want to upscale!', file=discord.File(
                         f, f'{partialpath}{dfif_command_message_id}.png')) # named something like: tmpgtv4qjix1111269940599738479.png 
+            elif not png_files:
+                await thread.send('png files are empty.')
 
             await thread.send(f'✅reacting with 1234...') 
             emoji_list = ['↖️', '↗️', '↙️', '↘️']