Removing trailing comma when including parents in toJson() method

Author: lucaslsl

activejdbc/src/main/java/org/javalite/activejdbc/Model.java

@@ -1000,10 +1000,6 @@ protected void toJsonP(StringBuilder sb, boolean pretty, String indent, String..
                 }
                 parent.toJsonP(sb, pretty, (pretty ? "      " + indent : ""));
 
-                if(i < (parentClasses.size() - 1)){
-                    sb.append(',');
-                }
-
                 if (pretty) {
                     sb.append("\n    ").append(indent);
                 }