Q:

Show message in vim map

I use fugitive vim plugin.
with a map and BufferIsEmpty function, I close the diff buffer if this don't have changes.
I use this map
nn <silent><leader>g0 :w <bar> Gsplit! diff -U0 <bar>                                
    \ exec BufferIsEmpty() ? "q <bar> echomsg 'git: No changes'" : ''<CR>

but, I don't see the message No changes

A:

I solved with redraw 
nn <silent><leader>g0 :w <bar> Gsplit! diff -U0 <bar>                                
    \ exec BufferIsEmpty() ? "q <bar> redraw <bar> echomsg 'git: No changes'" : ''<CR> 

