Another UUID conversion fix for database mode.

src/me/ryanhamshire/GriefPrevention/DatabaseDataStore.java

@@ -250,7 +250,7 @@ public class DatabaseDataStore extends DataStore
 				
 				String ownerName = results.getString("owner");
 				UUID ownerID = null;
-                if(ownerName.isEmpty())
+                if(ownerName.isEmpty() || ownerName.startsWith("--"))
                 {
                     ownerID = null;  //administrative land claim or subdivision
                 }