How to handle nodes that don't exist in the yaml file?

[alexisfrjp]

I want to access a field that isn't always present. When it isn't, it returns a parsing error such as throw type_error("The target node value type is not integer type.", n.get_type());

How can I set a default value to use when the node doesn't exist?

Thanks!

[alexisfrjp]

Updated the single header and now using get_value_or(), it wasn't present in 0.3.12.