scripts are removed if it is the only text in the editor

[Malcolm]

If yout type '<script></script>' into the editor in source mode, without any text before it, and then change out of source mode and back again, the script will be stripped out. If you put some text before the script, it will not be stripped.

[Alfonso Martínez de Lizarrondo]

This problem was fixed in [247] and you can test it in the nightly builds.

closing as dup of #351