no-jira: fix menu.html log error from velocity, fix warnings

src/main/java/org/olat/core/gui/control/generic/dtabs/DTabImpl.java

@@ -37,8 +37,6 @@ import org.olat.core.gui.control.navigation.NavElement;
 import org.olat.core.id.OLATResourceable;
 import org.olat.core.id.context.BusinessControlFactory;
 import org.olat.core.id.context.StackedBusinessControl;
-import org.olat.core.util.Formatter;
-import org.olat.core.util.i18n.I18nManager;
 import org.olat.repository.ui.RepositoyUIFactory;
 
 /**

src/main/java/org/olat/gui/control/_content/menu.html

@@ -3,20 +3,20 @@
 	#foreach($search in $searchs)
 	 	<li>$r.render($search)</li>
 	#end
-	#if($personalTools.size() > 0)
+	#if($personalTools && $personalTools.size() > 0)
 		<li role="presentation" class="dropdown-header">$r.translate("topnav.my.menu.tools")</li>
 		#foreach($personalTool in $personalTools)
 		 	<li>$r.render($personalTool)</li>
 		#end
 	#end
-	#if($configs.size() > 0)
+	#if($configs && $configs.size() > 0)
 		<li role="presentation" class="divider"></li>
 		<li role="presentation" class="dropdown-header">$r.translate("topnav.my.menu.configurations")</li>
 		#foreach($config in $configs)
 		 	<li>$r.render($config)</li>
 		#end
 	#end
-	#if($systems.size() > 0)
+	#if($systems && $systems.size() > 0)
 		<li role="presentation" class="divider"></li>
 		<li role="presentation" class="dropdown-header">$r.translate("topnav.my.menu.systems")</li>
 		#foreach($system in $systems)