my /boot directory on lvm volume with fedora is also empty
Did you edit any of your partition tables?
To restore your boot directory you should be able to use the Fedora CD/DVD
and use the partition manager
to create a new /boot directory. System Recovery or Rescue Mode is another option-
To fix this problem, boot in rescue mode and modify the /boot/grub/grub.conf file.
If not you may have to reinstall Fedora. I recommend Fedora 19 or 20.
Is this a laptop or a desktop? Make and model will help.