show cmd variable on errors

Author: serghey-rodin

web/templates/admin/add_cron.html

@@ -90,7 +90,7 @@
                             </tr>
                             <tr>
                                 <td>
-                                    <input type="text" size="30" class="vst-input long" name="v_cmd" <?php if (!empty($v_cmd)) echo "value='".$v_cmd."'"; ?>>
+                                    <input type="text" size="30" class="vst-input long" name="v_cmd" <?php if (!empty($v_cmd)) echo "value=".$v_cmd.""; ?>>
                                 </td>
                             </tr>
                         </table>