Fix ns detection logic in cider-read-and-eval

Author: Bozhidar Batsov

cider-interaction.el

@@ -1377,11 +1377,12 @@ With a PREFIX argument, print the result in the current buffer."
   "Read a sexp from the minibuffer and output its result to the echo area."
   (interactive)
   (let* ((form (cider-read-from-minibuffer "CIDER Eval: "))
-         (ns-form (if (cider-ns-form-p form) "" (cider-ns-form))))
+         (ns-form (if (cider-ns-form-p form) "" (format "(ns %s)" (cider-current-ns)))))
     (with-current-buffer (get-buffer-create cider-read-eval-buffer)
       (erase-buffer)
       (clojure-mode)
-      (insert ns-form "\n")
+      (unless (string= "" ns-form)
+        (insert ns-form "\n\n"))
       (let ((start-pos (point)))
         (insert form)
         (cider-interactive-eval form start-pos)))))