shell: some additions to *sh-misc/* tests

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/shell/ash_test/ash-misc/empty_args.right b/shell/ash_test/ash-misc/empty_args.right
new file mode 100644
index 0000000..968b5a4
--- /dev/null
+++ b/shell/ash_test/ash-misc/empty_args.right
@@ -0,0 +1,6 @@
+Null 0th arg:
+./empty_args.tests: line 2: : Permission denied
+127
+Null 1st arg:
+0
+Null arg in exec: