patch 8.2.1557: crash in :vimgrep when started as "vim -n"

Problem:    Crash in :vimgrep when started as "vim -n". (Raul Segura)
Solution:   Check mfp pointer. (Yegappan Lakshmanan, closes #6827)

src/testdir/test_quickfix.vim

@@ -2833,6 +2833,21 @@ func Test_vimgrep_with_no_last_search_pat()
   call delete('Xresult')
 endfunc
 
+" Test vimgrep without swap file
+func Test_vimgrep_without_swap_file()
+  let lines =<< trim [SCRIPT]
+    vimgrep grep test_c*
+    call writefile(['done'], 'Xresult')
+    qall!
+  [SCRIPT]
+  call writefile(lines, 'Xscript')
+  if RunVim([], [], '--clean -n -S Xscript Xscript')
+    call assert_equal(['done'], readfile('Xresult'))
+  endif
+  call delete('Xscript')
+  call delete('Xresult')
+endfunc
+
 func Test_vimgrep_existing_swapfile()
   call writefile(['match apple with apple'], 'Xapple')
   call writefile(['swapfile'], '.Xapple.swp')