Web Frontend: avoid double close of dialogs
Web Frontend: avoid double close of dialogs

When new page is shown all dialogs should be closed. This is a safety
against 'haning' dialogs. But to avoid double closes (which leads to
NPE) the close commands have to be removed.
BrunoEberhard/minimal-j,BrunoEberhard/minimal-j,BrunoEberhard/minimal-j