Script: fix load/save cycle

[janosvitok]

Excess empty line was created after each cycle.
Reported by benste at http://www.qlcplus.org/forum/viewtopic.php?f=21&t=11467

[mcallegari]

Not ok.
Try this:

• create a script
• add a wait command
• hit backspace
• save

The command is lost

[mcallegari]

The fix is this:

    while (result.count() && result.last().isEmpty())
        result.takeLast();