Patch 8.1.1447
Problem:    Not allowed to create an empty popup.
Solution:   Remove restriction that there is some text. (closes #4470)
Files:      src/popupwin.c, src/testdir/test_popupwin.vim


*** ../vim-8.1.1446/src/popupwin.c      2019-06-01 22:49:23.697685695 +0200
--- src/popupwin.c      2019-06-02 13:09:37.696928315 +0200
***************
*** 488,499 ****
      int           nr;
  
      // Check arguments look OK.
!     if (!(argvars[0].v_type == VAR_STRING
!               && argvars[0].vval.v_string != NULL
!               && STRLEN(argvars[0].vval.v_string) > 0)
!       && !(argvars[0].v_type == VAR_LIST
!           && argvars[0].vval.v_list != NULL
!           && argvars[0].vval.v_list->lv_len > 0))
      {
        emsg(_(e_listreq));
        return;
--- 488,495 ----
      int           nr;
  
      // Check arguments look OK.
!     if (!(argvars[0].v_type == VAR_STRING && argvars[0].vval.v_string != NULL)
!       && !(argvars[0].v_type == VAR_LIST && argvars[0].vval.v_list != NULL))
      {
        emsg(_(e_listreq));
        return;
***************
*** 560,571 ****
      {
        list_T *l = argvars[0].vval.v_list;
  
!       if (l->lv_first->li_tv.v_type == VAR_STRING)
!           // list of strings
!           add_popup_strings(buf, l);
!       else
!           // list of dictionaries
!           add_popup_dicts(buf, l);
      }
  
      // Delete the line of the empty buffer.
--- 556,570 ----
      {
        list_T *l = argvars[0].vval.v_list;
  
!       if (l->lv_len > 0)
!       {
!           if (l->lv_first->li_tv.v_type == VAR_STRING)
!               // list of strings
!               add_popup_strings(buf, l);
!           else
!               // list of dictionaries
!               add_popup_dicts(buf, l);
!       }
      }
  
      // Delete the line of the empty buffer.
*** ../vim-8.1.1446/src/testdir/test_popupwin.vim       2019-06-01 
22:49:23.701685671 +0200
--- src/testdir/test_popupwin.vim       2019-06-02 13:19:58.857248458 +0200
***************
*** 596,598 ****
--- 596,612 ----
    call popup_close(winid, 'done')
    call assert_equal('done', g:result)
  endfunc
+ 
+ func Test_popup_empty()
+   let winid = popup_create('', {'padding': [2,2,2,2]})
+   redraw
+   let pos = popup_getpos(winid)
+   call assert_equal(4, pos.width)
+   call assert_equal(5, pos.height)
+ 
+   let winid = popup_create([], {'border': []})
+   redraw
+   let pos = popup_getpos(winid)
+   call assert_equal(2, pos.width)
+   call assert_equal(3, pos.height)
+ endfunc
*** ../vim-8.1.1446/src/version.c       2019-06-01 22:49:23.701685671 +0200
--- src/version.c       2019-06-02 13:21:01.044891751 +0200
***************
*** 769,770 ****
--- 769,772 ----
  {   /* Add new patch number below this line */
+ /**/
+     1447,
  /**/

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