Do not add a quickfix item for a refused tag address

The cursor has not moved, so the item repeated the previous entry's line and
text. :BTags already skips such an entry.

autoload/fzf/vim.vim

@@ -1764,6 +1764,9 @@ function! s:tags_sink(from, lines)
         else
           call s:open(expand(abspath, 1))
         endif
+        if empty(excmd)
+          continue
+        endif
         call s:execute_tag_address(excmd)
         call add(qfl, {'filename': expand('%'), 'lnum': line('.'), 'text': getline('.')})
         if empty(tagname)