msi: Don't set the shortcut's working directory if it's NULL.
[wine] / dlls / advpack /
drwxr-xr-x   ..
-rw-r--r-- 315 Makefile.in
-rw-r--r-- 30533 advpack.c
-rw-r--r-- 4420 advpack.spec
-rw-r--r-- 1187 advpack_private.h
-rw-r--r-- 32325 files.c
-rw-r--r-- 26870 install.c
-rw-r--r-- 13259 reg.c
drwxr-xr-x - tests