Eliminate warnings from tests
Eliminate warnings from tests

One test was spewing (harmless) warnings about there not being a
decide-policy signal on our mock webview. This creates one (though it
is never emitted.)
[endlessm/eos-sdk#1528]

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib