I15cc2d6ae48e505c2da121880e27481dedf36d3b catches exceptions for
specific RPC endpoints affected by a recent change related to
push-notifications. There may be more changes like that in the future,
so instead of fixing them one by one, this patch consistently catches
exceptions from all cast calls for all RPC clients.
Change-Id: Ia7e6cd717758a9d5b18fe9cb07c55938f52040ce
Partial-Bug: #1705351