[BUG] meeting-note filename when headline prefix is empty

[rasa-silva]

Simple bug/request for meeting-note script:

When the "headline prefix" is empty, the note filename will start with a blank space.
In this case, it would make sense to remove the blank space separator.

Something like

        var headline
        if (headlinePrefix != '') {
            headline = headlinePrefix + " " + dateString;
        } else {
            headline = dateString;
        }

instead of

var headline = headlinePrefix + " " + dateString;

@pbek , @sanderboom , @wiktor2200

[pbek]

It wasn't really meant to have no prefix.
But you can make a PR if you want.
Can you then please also bump the version number in the info.json so users will get an update notification?