Handle null repeated and nested fields in VendorAtom

Bug: 237423972
Bug: 237424483
Test: build, flash, and run aidl_stats_client on device
Test: atest VtsAidlHalStatsTargetTest
Test: atest VtsVendorAtomJavaTest
Change-Id: Id233024078d7daa658650765b26ff11ba9ca6f34
1 file changed