You're correct. If Liquid crashes the system creates a blank sequence in the same project and opens up on it. You should be able to open the original sequence and then delete the blank.
When I start a project I rename the sequence to "Development" and at the end of each editing session I copy/Paste the sequence and rename the copy to PROD _"aabbcc" where a = month, b=day, c=year. That way I can always go back to the last session I created.
Of course after ending each sediting ession I also back up the project, from the manage projects menu.
But my point about renaming, is that I don't want the real sequence and the new blank sequence to have the same name. I may accidently delete the wrong one.
I try to use software development back up practices.