There

"And now, to add to those anxieties, the party has a new headache: if Richmond Park and Sleaford are anything to go by, there exists a swath of liberal, pro-EU voters to whom Labour does not speak, and who are willing to put aside any bad feelings about the Nick Clegg years and vote for the Lib Dems." (The Guardian.)

Is "there" a dummy or locative one in "there exists" in the sentence above?