refactor: Standardwert für Icon in Locale

fix: wenn keine Icon --> div soll weg

locale.xml

@@ -99,8 +99,8 @@
             <ad><![CDATA[]]></ad>
         </locale>
         <locale name="menu.control.navigation.setting.levelIcon">
-            <de><![CDATA[Weitere Ebenen Icon</br>Standard: </br>angle-double-right]]></de>
-            <en><![CDATA[Navigation levels icon<br/>Default: </br>angle-double-right]]></en>
+            <de><![CDATA[Weitere Ebenen Icon</br>Standard: </br>fa-angle-double-down]]></de>
+            <en><![CDATA[Navigation levels icon<br/>Default: </br>fa-angle-double-down]]></en>
             <ad><![CDATA[]]></ad>
         </locale>
     </groups>

src/QUI/Menu/SidebarDropDownMenu.Simple.html

@@ -53,10 +53,14 @@
 
 
             {if count ( $subnavigation ) && ($level < $levels || $levels == 0)}
-                <i class="fa quiqqer-fa-list-icon fa-fw {$levelIcon} quiqqer-fa-levels-icon
-                {if $Rewrite->isIdInPath($Child->getId())} fa-nav-levels-rotate{/if} "></i>
+                {if $levelIcon}
+                    <i class="fa quiqqer-fa-list-icon fa-fw {$levelIcon} quiqqer-fa-levels-icon
+                        {if $Rewrite->isIdInPath($Child->getId())} fa-nav-levels-rotate{/if} "></i>
+                {/if}
             {else}
+                {if $listIcon}
                 <i class="fa quiqqer-fa-list-icon fa-fw {$listIcon}"></i>
+                {/if}
             {/if}
 
             <a href="{url site=$Child}" class="quiqqer-navigation-link