UGENE GUI is in incorrect state after creating a sequence if project doesn't exist

Scenario to reproduce:

1. Ensure that project is not opened yet.
2. Click {File -> New document from text...}

   in the main menu.

3. Fill the dialog with some data. Accept the dialog.
   Current state: the sequence is successfully created and saved, but UGENE GUI works like you have an opened modal dialog: menu items inside the main menu are disabled, UGENE ignores mouse and most of keyboard clicks etc.

This is a consequence of Qt5 bug in the qcocoaeventdispatcher.mm file (libqcocoa.dylib plugin): link the issue will be added later. To avoid this behavior CreateDocumentFromTextDialogController should be changed. Currently, it creates the project, waits for it and then closes. It should register all tasks and close without waiting for them.