[Backport 12.5] Unable to extract JSON array with scalar elements from Resource object

For example, a response with the following JSON object:

{"list": ["a","b","c"]}

The following code snippet will throw a java.lang.IllegalArgumentException: Invalid offset: 0 (size = 0), because list contains 0 child:

Resource list = response.getValue("list", Resource.class);
ResourceCollection collection = list.getChildren();

The reason is, for an ArrayNode backed Resource, JacksonResource#getInternalAllChildren() only add elements of type ContainerNode to the children. See code snippet below:

JsonNode value;
int index = 0;

for (Iterator<JsonNode> it = jsonNode.elements(); it.hasNext();) {
	value = it.next();

	if (value.isContainerNode()) {
		list.add(this.toChildIndexedJacksonResource(value, ++index));
	}
}