Allow PRIVATE_SKPS_GS to be empty in assets/skp/create.py

NoTry: true
Change-Id: I9dd3ef35812f3a2c6d3c51627f908d3f9d939bda
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/239441
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Ravi Mistry <rmistry@google.com>
1 file changed