TBR namespace-browser: Fix makeRPC test
TBR namespace-browser: Fix makeRPC test

Recently, veyron.js changed 0-output RPCs to return undefined instead
of the empty array.

The corresponding makeRPC test was updated.

Change-Id: Icfd04297ca856f1d17084206933534f4945a3c6b

vanadium/browser,vanadium/browser,vanadium/browser,vanadium/browser