Exception processing added for CallDBusMethod::op.

Patch adds exception processing for CallDBusMethod::op function.
It prevents phosphor-dbus-monitor crashes, when calling service
doesn't exist.

Change-Id: Iac9be4c14a52fa9c12eb08dfec1f4dfd68e8cdfb
Signed-off-by: Alexander Soldatov <a.soldatov@yadro.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
2 files changed