openDocument not opening new document dialog

It's been discovered that `postMessage({ command: "openDocument", arguments: "" })` is currently not opening the new, SCIL-based, document dialog.

If you have webtools installed the document will still be opened as expected, so this issue is noticeable if you expect the document dialog to show inside of SuperOffice.

This means that anyone using the CrossMessaging library, and using the openDocumen method specifically, also will be affected by this since its using postMessage under the hood.

This thread will be updated when we have implemented a fix.