Make dummy RPC calls non-panicking

BUG=chromium:1051691
TEST=emerge and run_tests.sh

Change-Id: Icd99ccfe1d2f1adf0268205dfd41804b031683af
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/tnull/+/2304716
Tested-by: Jacob Kopczynski <jkop@chromium.org>
Auto-Submit: Jacob Kopczynski <jkop@chromium.org>
Reviewed-by: Prathmesh Prabhu <pprabhu@chromium.org>
Commit-Queue: Prathmesh Prabhu <pprabhu@chromium.org>
3 files changed