Handle null GrDirectContext in DDL Fuzzer

Bug: oss-fuzz:24449
Change-Id: I379e12ef12d45d4959db72ce90ebeaf1d1933623
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/307221
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
1 file changed