It's consistent that Starfleet has no forces anywhere near Bajor, as the place supposedly is out in the sticks - or at least far out of the focus of Starfleet deployments, as everybody originally thought Bajor was insignificant. (Perhaps there wasn't even a Starbase 375 in the neighborhood yet? But even that place was rather distant from Bajor.)
On the other hand, sending even one ship would still mean that the Federation is not giving up on DS9, which is a much-needed political signal in the circumstances. The ships would not affect the course of the battle one way or the other - but if Gowron fired at them, he'd be committing to much more than if he just fired at a Bajoran space station.