code: static Claim claimFromNode(JsonNode node, ObjectReader objectReader) {
          if (node == null || node.isNull() || node.isMissingNode()) {
              return new NullClaim();
          }
          return new JsonNodeClaim(node, objectReader);
      }
docs: Helper method to create a Claim representation from the given JsonNode.
  
  @param node the JsonNode to convert into a Claim.
  @return a valid Claim instance. If the node is null or missing, a NullClaim will be returned.