Simpler quickfix behavior

Previous behavior was based on my incorrect assumption that :cwindow
would open for only invalid entries.

autoload/dispatch.vim

@@ -642,11 +642,7 @@ endfunction
 
 function! s:open_quickfix(request, copen) abort
   let was_qf = &buftype ==# 'quickfix'
-  if a:copen || !empty(filter(getqflist(), 'v:val.valid'))
-    copen
-  else
-    cclose
-  endif
+  execute 'botright' (a:copen ? 'copen' : 'cwindow')
   if &buftype ==# 'quickfix' && !was_qf && !a:copen
     wincmd p
   endif

doc/dispatch.txt

@@ -16,8 +16,7 @@ COMMANDS                                        *dispatch-commands*
                         build in the foreground.  Adapter strategies vary, but
                         the goal is visibility without stealing focus.  When
                         the build is complete, load the results into the
-                        |quickfix| list.  The quickfix window is opened if
-                        there are any matching errors.  This command is
+                        |quickfix| list and call |:cwindow|.  This command is
                         preferred for shorter tasks like "build this file."
 
 :Make! [arguments]      Using the current compiler settings, dispatch a build