Fix welcome

autoload/SpaceVim.vim

@@ -313,9 +313,11 @@ endfunction
 
 
 function! SpaceVim#welcome() abort
-    VimFiler
-    wincmd p
-    Startify
+    if exists(':VimFiler') == 2 && exists(':Startify') == 2
+        VimFiler
+        wincmd p
+        Startify
+    endif
 endfunction
 
 ""

autoload/SpaceVim/layers/ui.vim

@@ -4,6 +4,7 @@ function! SpaceVim#layers#ui#plugins() abort
                 \ ['Yggdroot/indentLine'],
                 \ ['mhinz/vim-signify'],
                 \ ['majutsushi/tagbar', {'loadconf' : 1}],
+                \ ['lvht/tagbar-markdown',{'merged' : 0}],
                 \ ['vim-airline/vim-airline',                { 'merged' : 0,  'loadconf' : 1}],
                 \ ['vim-airline/vim-airline-themes',         { 'merged' : 0}],
                 \ ['mhinz/vim-startify', {'loadconf' : 1}],