Easy way
See if you can load one of the automatic saves (I don't have DoD, but they should be in a page labelled 'A' or 'Auto')
Hard way
I have tested this solution with another game and it should work:
- open the game\saves folder
- find the save you want to fix. Their filenames should be something like X-Y-LT1.save, where X is the page and Y the slot. E.g.: 2-6-LT1.save is the save stored in the 2nd page, 6th slot
- backup the save
- change the file extension from .save to .zip (yes, saves are actually zip archives)
- open the .zip and extract all the files in a new folder
- the save name should be stored into the "json" file. Edit it with Notepad++, then save. If you want a nameless file, write this:
- drag and drop the "json" file back into the zip file: Winzip/Winrar should be smart enough to replace the original "json" file. If it doesn't work, select all the files and create a new .zip archive, then rename it like the original one. It must be a ZIP, not a RAR
- change back the extension from .zip to .save, then put it back into the game\saves folder
- load your save