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
targzFormatButton.setSelection(false);
        targzFormatButton.setFont(font);
    }    
    
    /**
     * Returns a boolean indicating whether the directory portion of the
     * passed pathname is valid and available for use.
     */
    protected boolean ensureTargetDirectoryIsValid(String fullPathname) {
        int separatorIndex = fullPathname.lastIndexOf(File.separator);
        if (separatorIndex == -1) 
            return true;
        return ensureTargetIsValid(new File(fullPathname.substring(0,
                separatorIndex)));
    }
    /**
     * Returns a boolean indicating whether the passed File handle is
     * is valid and available for use.
     */
    protected boolean ensureTargetFileIsValid(File targetFile) {
        if (targetFile.exists() && targetFile.isDirectory()) {
            displayErrorDialog(DataTransferMessages.ZipExport_mustBeFile);
            giveFocusToDestination();
            return false;
        }
        if (targetFile.exists()) {
            if (targetFile.canWrite()) {
                if (!queryYesNoQuestion(DataTransferMessages.ZipExport_alreadyExists))
                    return false;
            } else {