APT could possibly test whether any packages would be deleted before displaying this prompt, but I don't think it's worth the effort. If you don't like the prompt (or it doesn't apply to your configuration), you should disable it by placing the following in /etc/apt/apt.conf:
DSelect::Clean "never"; You could also use "always" to have the cache always cleaned, without prompting. See apt.conf(5) for details. -- - mdz

