I doubt we'd even find out if there were any victims, or ever will be. The thing is, though, whistleblowers always get shit on. And the thing is, Manning is guilty of leaking over 72,000 documents. There's no way Manning was fully aware of the content about to be dumped upon the entire world.
The Rosenbergs were executed for spying. Now, at the time, one could argue that it was a victimless crime, but documents supplied to the Soviets were later used to build the weapon which shot down Gary Powers' U2 in 1960.
Even though I'm sympathetic and have..."enjoyed" isn't the right word, but let's go with that...watching Obama not only renege on his promise of open government and has gone out of his way to personally vilify Manning, let's not forget that Bradley Manning (for he was Bradley back then) took the Oath of Enlistment and was therefore sworn to protect the country and Constitution. It can be argued that he's protecting it against itself, but he's also potentially putting the nation in danger by giving intelligence to countries that aren't terribly pleased with the United States. Manning won't go free.
And if "didn't cause harm" is a defense, does that mean I can tell my kids to go play in traffic as long as nobody gets hurt?