removed unnecessary redundancy between removeLeaderboardGroups and removeLeaderboardGroup

java/com.sap.sailing.gwt.ui/src/main/java/com/sap/sailing/gwt/ui/adminconsole/LeaderboardGroupConfigPanel.java

@@ -556,6 +556,12 @@ public class LeaderboardGroupConfigPanel extends AbstractRegattaPanel implements
         });
     }
 
+    /**
+     * If no leaderboard group is selected or more than one is selected, this method is a no-op because the
+     * leaderboard list displayed is defined to the be list of all leaderboards available, excluding those
+     * leaderboards that are already assigned to <em>the</em> selected leaderboard group. In other words,
+     * the leaderboard list is only well-defined in case a single leaderboard group is selected.
+     */
     private void refreshLeaderboardsList() {
         final LeaderboardGroupDTO selectedGroup = getSelectedGroup();
         final Set<StrippedLeaderboardDTO> selectedLeaderboards = leaderboardsSelectionModel.getSelectedSet();
@@ -699,7 +705,7 @@ public class LeaderboardGroupConfigPanel extends AbstractRegattaPanel implements
     }
 
     private void removeLeaderboardGroup(final LeaderboardGroupDTO group) {
-        sailingService.removeLeaderboardGroup(group.getName(), new AsyncCallback<Void>() {
+        sailingService.removeLeaderboardGroups(Collections.singleton(group.getName()), new AsyncCallback<Void>() {
             @Override
             public void onFailure(Throwable t) {
                 errorReporter.reportError("Error trying to remove leaderboard group " + group.getName() + ": "

java/com.sap.sailing.gwt.ui/src/main/java/com/sap/sailing/gwt/ui/client/SailingService.java

@@ -215,8 +215,6 @@ public interface SailingService extends RemoteService {
     
     void renameLeaderboardGroup(String oldName, String newName);
     
-    void removeLeaderboardGroup(String groupName);
-
     void removeLeaderboardGroups(Set<String> groupNames);
     
     LeaderboardGroupDTO createLeaderboardGroup(String groupName, String description,

java/com.sap.sailing.gwt.ui/src/main/java/com/sap/sailing/gwt/ui/client/SailingServiceAsync.java

@@ -265,11 +265,6 @@ public interface SailingServiceAsync {
      */
     void renameLeaderboardGroup(String oldName, String newName, AsyncCallback<Void> callback);
 
-    /**
-     * Removes the leaderboard group with the name <code>groupName</code> from the service and the persistant store.
-     */
-    void removeLeaderboardGroup(String groupName, AsyncCallback<Void> callback);
-
     /**
      * Removes the leaderboard groups with the given names from the service and the persistant store.
      */

java/com.sap.sailing.gwt.ui/src/main/java/com/sap/sailing/gwt/ui/server/SailingServiceImpl.java

@@ -2462,8 +2462,7 @@ public class SailingServiceImpl extends ProxiedRemoteServiceServlet implements S
         }
     }
 
-    @Override
-    public void removeLeaderboardGroup(String groupName) {
+    private void removeLeaderboardGroup(String groupName) {
         getService().apply(new RemoveLeaderboardGroup(groupName));
     }