Emacs(Elisp): forward/backward-paragraphだとparagraph判定がおそらくシンタックステーブル依存になり、字義通りの「次の空行」にならないので、別途用意。

move(region)-to-next(previous)-blank-line.el

;;; ------------------------------------------------------------
;;; 次/前の空行
;; gist-description: Emacs(Elisp): forward/backward-paragraphだとparagraph判定がおそらくシンタックステーブル依存になり、字義通りの「次の空行」にならないので、別途用意。
;; gist-id: ad27b19dd3779ccc1ff2
;; gist-name: move(region)-to-next(previous)-blank-line.el
;; gist-private: nil

(defun move-to-previous-blank-line ()
  "Go to previous empty lines."
  (interactive "^")
  (goto-char
   (or (save-excursion
         (unless (bobp)
           (backward-char)
           (re-search-backward "^$" nil t)))
       (point-min))))

(defun move-to-next-blank-line ()
  "Go to next empty lines."
  (interactive "^")
  (goto-char
   (or (save-excursion
         (unless (eobp)
           (forward-char)
           (re-search-forward "^$" nil t)))
       (point-max))))

(global-set-key (kbd "<M-up>") 'move-to-previous-blank-line)
(global-set-key (kbd "<M-down>") 'move-to-next-blank-line)