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/extensions/org/eclipse/ui/dialogs/WizardExportResourcesPage.java
protected void internalSaveWidgetValues() {
    }
    /**
     * Queries the user for the resource types that are to be exported and returns
     * these types as an array.
     *
     * @return the resource types selected for export (element type: 
     *   <code>String</code>), or <code>null</code> if the user canceled the 
     *   selection
     */
    protected Object[] queryResourceTypesToExport() {
        TypeFilteringDialog dialog = new TypeFilteringDialog(getContainer()
                .getShell(), getTypesToExport());
        dialog.open();
        return dialog.getResult();
    }
    /**
     * Restores resource specification control settings that were persisted
     * in the previous instance of this page. Subclasses wishing to restore
     * persisted values for their controls may extend.
     */
    protected void restoreResourceSpecificationWidgetValues() {
    }
    /**
     * Persists resource specification control setting that are to be restored
     * in the next instance of this page. Subclasses wishing to persist additional
     * setting for their controls should extend hook method 
     * <code>internalSaveWidgetValues</code>.
     */
    protected void saveWidgetValues() {