Fix check without rank

Signed-off-by: Lixfel <agga-games@gmx.de>

src/de/steamwar/bungeecore/commands/CheckCommand.java

@@ -49,7 +49,8 @@ public class CheckCommand extends BasicCommand {
 
     public static void setCheckQuestions(SchematicType checkType, Configuration config) {
         checkQuestions.put(checkType, config.getStringList("CheckQuestions"));
-        ranks.put(checkType, config.getStringList("Ranks"));
+        if(!config.getStringList("Ranks").isEmpty())
+            ranks.put(checkType, config.getStringList("Ranks"));
     }
 
     public static boolean isChecking(ProxiedPlayer player){