patch 8.2.3813: confusing error when using :cc without error list

Problem:    confusing error when using :cc without error list. (Gary Johnson)
Solution:   Give the "no errors" error.
diff --git a/src/testdir/test_quickfix.vim b/src/testdir/test_quickfix.vim
index 283e943..895c52a 100644
--- a/src/testdir/test_quickfix.vim
+++ b/src/testdir/test_quickfix.vim
@@ -86,6 +86,12 @@
   endif
 endfunc
 
+" This must be run before any error lists are created.
+func Test_AA_cc_no_errors()
+  call assert_fails('cc', 'E42:')
+  call assert_fails('ll', 'E42:')
+endfunc
+
 " Tests for the :clist and :llist commands
 func XlistTests(cchar)
   call s:setup_commands(a:cchar)