Add null check for pendingIntent2 ProtoLogs

* Mark argument as @Nullable as well

Test: Crash doesn't happen
Fixes: 328459060
Change-Id: Ib301a280e769cd9170fb5f02e3ddce111d796298
Merged-In: Ib301a280e769cd9170fb5f02e3ddce111d796298
1 file changed