org-ql-find: Quoted empty string causes `peg` parsing error

[alphapapa]

Typing "" into org-ql-find's prompt gives this error in the *Messages* buffer, and the command must be exited and recalled for it to work again:

Error in post-command-hook (vertico--exhibit): (peg-search-failed 3 ((not (or (call separator) (char 34))) "\"" quoted-arg))