NPE in PluginElementVisitor findNamedNode

[azakordonets]

Description

In PluginElementVisitor -> findNamedNode there's no check whether childType is null or not. Therefore it can throw nullpointer sometimes.

Configuration

Version: 2.20.0

Operating system: Mac OS 13.1

JDK: amazon-corretto-11.jdk

if (childType == null) {
     //System.out.println();
}
if (name.equalsIgnoreCase(childType.getElementName()) ||
 this.conversionType.isAssignableFrom(childType.getPluginClass())) {
 // FIXME: check child.getObject() for null?

if childType is null, then the check won't do anything and nullpointer will be thrown on the next if statement

I have already create PR to fix this issue