Joseph Smith usually removed instances of multiple negation in his editing for the 1837 edition, including two instances of “nor never”, here in Jacob 7:9 and later in the book of Alma:
The original text had no instances of the standard “nor ever”, only these two of “nor never”. For a general discussion regarding the removal of double negatives from the text, see multiple negation in volume 3.
Summary: Restore the original multiple negative in Jacob 7:9 (“there is no Christ / neither hath been nor never will be”).