In plain words the answer means that when Avast blocks a threat, the malware could not have made contact with your computer,
and that you had a lucky escape. Avast protected you from a malware infection! You are safe and secure!
polonus
The cause is a so-called redirect to a malware website when you visit site A that has hidden redirectcode to a malcoded site B (the site you claimed you never clicked, and you did not, but were brought there by infection) you can infested, you never willfully clicked that website but you were directed there through probably hidden obfuscated malcode. Site A could not be aware malcreants have added such a malicious hidden redirect to their website, but Avast detected it and made you could not go there by blocking it. It is a bit sinister story but malcreants work in such hideous ways to infest the unaware and those without protection from Avast.
Damian