Add a blank default option

Sometimes I'll find myself refreshing the page & thinking I'm looking at the log I want but it'll be the first option in the drop down menu that gets loaded.

I've solved this just by adding a blank default option so that no logs are shown at the start of the page loading.

Eventually I want to add a message box in the white content area below the connection status saying, "Please select a log from the drop down menu" on the default option but that'll have to come in a future pull request.