org-e-ascii: Fix column width with cells containing an object not exported

* EXPERIMENTAL/org-e-ascii.el (org-e-ascii-table):  width may be
  wrong when some object is removed from a cell during export

EXPERIMENTAL/org-e-ascii.el

@@ -1626,20 +1626,20 @@ CONTENTS is nil.  INFO is a plist holding contextual information."
 	      (alignment (plist-get table-info :alignment))
 	      (clean-table (org-export-clean-table raw-table special-col-p))
 	      ;; Change table into lisp, much like
-	      ;; `org-table-to-lisp', being more careful about keeping
-	      ;; the exact length of cells, for alignment purpose.
-	      ;; Cells are parsed and transcoded along the way.
+	      ;; `org-table-to-lisp', though cells are parsed and
+	      ;; transcoded along the way.
 	      (lisp-table
 	       (mapcar
 		(lambda (line)
 		  (if (string-match org-table-hline-regexp line) 'hline
 		    (mapcar
 		     (lambda (cell)
-		       (org-export-secondary-string
-			(org-element-parse-secondary-string
-			 cell
-			 (cdr (assq 'item org-element-string-restrictions)))
-			'e-ascii info))
+		       (org-trim
+			(org-export-secondary-string
+			 (org-element-parse-secondary-string
+			  cell
+			  (cdr (assq 'item org-element-string-restrictions)))
+			 'e-ascii info)))
 		     (org-split-string (org-trim line) "\\s-?|\\s-?"))))
 		(org-split-string clean-table "[ \t]*\n[ \t]*")))
 	      ;; Compute real column widths.