Make sure it isn't a cable acutated disk brake. If it is, it is possible to adjust some slack into it. If the brake is indeed hydraulic, you wont be able to adjust it. A lack of brake fluid wouldn't cause the brake to drag. You could check for return springs and make sure the pads are seated into the caliper correctly. You could even disassemble the brake and use brake grease on the sliding parts. If the drag is very slight, I wouldn't worry about it; the drag will disappear within the first few miles especially if you use the brakes.
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