fix: Database return null if object does not exist

varo/src/main/java/de/cliffbreak/varo/database/Database.java

@@ -77,6 +77,9 @@ public class Database {
         try {
             final Statement s = this.conn.createStatement();
             final ResultSet rs = s.executeQuery("SELECT " + type + " FROM playercache WHERE `player` ='" + uuid + "';");
+            if (rs.next() == false) {
+                return null;
+            }
             final Object obj = rs.getObject(type);
             s.close();
             return obj;