Bug 97523 [Import/Export] Get overwrite prompt before no resources selected prompt
3.1 RC1 - File > Export > Archive - clear any selected resources - enter an archive file name where the file already exists - Finish - it prompts to overwrite the file; choose Yes - it says "There are no resources currently selected for export" (OK) Should get the "no resources" prompt first, and not bother with the second one. Should check the other export wizards too.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/WizardArchiveFileResourceExportPage1.java
}
    /**
     * Create an instance of this class
     * @param selection the selection
     */
    public WizardArchiveFileResourceExportPage1(IStructuredSelection selection) {
        this("zipFileExportPage1", selection); 
        setTitle(DataTransferMessages.ArchiveExport_exportTitle);
        setDescription(DataTransferMessages.ArchiveExport_description);
    }
    /** (non-Javadoc)
     * Method declared on IDialogPage.
     */
    public void createControl(Composite parent) {
        super.createControl(parent);
        PlatformUI.getWorkbench().getHelpSystem().setHelp(getControl(),
                IDataTransferHelpContextIds.ZIP_FILE_EXPORT_WIZARD_PAGE);
    }
    /**
     *	Create the export options specification widgets.
     *
     */
    protected void createOptionsGroupButtons(Group optionsGroup) {
    	Font font = optionsGroup.getFont();
    	optionsGroup.setLayout(new GridLayout(2, true));
    	
    	Composite left = new Composite(optionsGroup, SWT.NONE);
    	left.setLayoutData(new GridData(SWT.LEFT, SWT.TOP, true, false));
    	left.setLayout(new GridLayout(1, true));
        createFileFormatOptions(left, font);