Bug 5765 New Class button in empty workspace should be more supportive
User feedback: "Confused how to create my first project" We should be more supportive in the UI for this special case since it is a first time experience with the UI. Therefore when the workbench is empty we should offer to create a new Java project. Minimal solution is to show an info dialog that explains that user should create a project first and offer a button to open the Java project wizard. The same is true for the new package and new interface buttons.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/actions/AbstractOpenWizardAction.java
ISelection selection= window.getSelectionService().getSelection();
			if (selection instanceof IStructuredSelection) {
				return (IStructuredSelection) selection;
			}
			
		}
		return null;
	}
	/**
	 * The user has invoked this action.
	 */
	public void run() {
		if (!fNoChecking && !canActionBeAdded()) {
			return;
		}
		
		Wizard wizard= createWizard();
		if (wizard instanceof IWorkbenchWizard) {
			((IWorkbenchWizard)wizard).init(getWorkbench(), getCurrentSelection());
		}
		WizardDialog dialog= new WizardDialog(JavaPlugin.getActiveWorkbenchShell(), wizard);
		dialog.create();
		dialog.getShell().setText(JavaUIMessages.getString("AbstractOpenWizardAction.title")); 
		dialog.open();
	}
	
	/**
	 * Tests if the action can be run on the current selection.
	 */
	public boolean canActionBeAdded() {