Size zero Load dialog

[paolo2504]

Doing File/load on release .14 the dialog opens with no dimension and only a thin vertical bar can be seen on top left of the screen.
I noticed this on newly installed GO on Raspberry 3b+, never on Windows or other Linux distro.

Considering that the demo organ is not installed by default in this arm release, I suppose that this is the problem: as no organ is installed the file/load function does open a dialog that is empty so it's resized to null/0 dimensions.
Actually, Windows and linux version comes with the demo organ automatically installed so it is possible that issue should arise also on those version but was never seen because in that cases the Organs dialog is populated since installation.

I installed the grandorgue-demo_***** file and issue has disappeared so dialog is now ok.

(not a big issue indeed but it took a couple of minutes to understand why no "Load" dialog was opened and why the main windows didn't respond (it was blocked by the other; only way is to press Esc).