term: handle buffer/directory deletion on exit

Do not try to process the job results of a terminal job if the original
buffer or directory does not exist on exit. This is probably only an
issue in CI.

autoload/go/term.vim

@@ -147,12 +147,18 @@ func s:handle_exit(job_id, exit_status, state) abort
   let l:winid = win_getid(winnr())
   call win_gotoid(a:state.winid)
 
+  let l:bufdir = fnameescape(expand('%:p:h'))
+  if !isdirectory(l:bufdir)
+    call win_gotoid(l:winid)
+    return
+  endif
+
   " change to directory where test were run. if we do not do this
   " the quickfix items will have the incorrect paths.
   " see: https://github.com/fatih/vim-go/issues/2400
   let l:cd = exists('*haslocaldir') && haslocaldir() ? 'lcd ' : 'cd '
   let l:dir = getcwd()
-  execute l:cd . fnameescape(expand("%:p:h"))
+  execute l:cd . l:bufdir
 
   let l:listtype = go#list#Type("_term")