Actually, the Maquis would
be just the sort to be prepared to flee at a moment's notice - they know they are being hunted, after all.
And the population of the planet apparently was quite low, as is typical of colonies in DS9 and TNG: Eddington said that Sisko's actions would turn hundreds of thousands into refugees if Sisko eliminated every Maquis colony out there
! Since there apparently are more than two such colonies out there, we're talking about populations numbered in mere thousands...
"Nobody died" might thus be a good approximation, although I suspect there would have been some less hardy individuals, like kids and grannies, who either died of Sisko's toxins or were trampled to death in the evacuation.