ensure '' entryPath for templateAdapter on client

without this when you instantiate your app with an entryPath (as we do in our
unit tests), it will fail client-side because the `clientEntryPath` is only
passed to the ClientRouter, but not to the templateAdapter
Merge pull request #196 from c089/ensure-empty-entrypath-for-template-adapter-on-client

ensure empty entryPath for templateAdapter on client