Support for zero commands requiring access trust.

Now the list of commands requiring access trust to execute in land
claims can be empty without any odd side-effects.

src/me/ryanhamshire/GriefPrevention/GriefPrevention.java

@@ -825,9 +825,12 @@ public class GriefPrevention extends JavaPlugin
         this.config_claims_commandsRequiringAccessTrust = new ArrayList<String>();
         String [] commands = accessTrustSlashCommands.split(";");
         for(int i = 0; i < commands.length; i++)
+        {
+            if(!commands[i].isEmpty())
             {
                 this.config_claims_commandsRequiringAccessTrust.add(commands[i].trim().toLowerCase());
             }
+        }
         
         //try to parse the list of commands which should be monitored for spam
         this.config_spam_monitorSlashCommands = new ArrayList<String>();