Is your feature request related to a problem? Please describe.
Feature request from @holgerroth :
can we add a default return to get_parsed_content(), similar to how you can do get("key", None) in dictionaries?
I have this use case where I want to parse and instantiate optional filters. So, they might not always exist in the configuration file. Currently, I solve it with try/except blocks here, but using:

self.pre_filters = self.filter_parser.get_parsed_content("pre_filters", default=None) 

would be nicer, I think.