Error trapping and output

src/engine/workthreads/DestroyCityThread.java

@@ -58,6 +58,8 @@ public class DestroyCityThread implements Runnable {
             newParent = cityZone.parent;
             formerGuild = city.getTOL().getGuild();
 
+            Logger.info("Destroy city thread started for: " + newParent.zoneName);
+
             // Former guild loses tree!
 
             if (DbManager.GuildQueries.SET_GUILD_OWNED_CITY(formerGuild.getObjectUUID(), 0)) {