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
} catch (InterruptedException e) {
            return false;
        } catch (InvocationTargetException e) {
            displayErrorDialog(e.getTargetException());
            return false;
        }
        IStatus status = op.getStatus();
        if (!status.isOK()) {
            ErrorDialog.openError(getContainer().getShell(),
                    DataTransferMessages.DataTransfer_exportProblems,
                    null, 
                    status);
            return false;
        }
        return true;
    }
    /**
     * The Finish button was pressed.  Try to do the required work now and answer
     * a boolean indicating success.  If false is returned then the wizard will
     * not close.
     * @returns boolean
     */
    public boolean finish() {
        if (!ensureTargetIsValid())
            return false;
        List resourcesToExport = getWhiteCheckedResources();
        
        saveDirtyEditors();
        
        saveWidgetValues();