* get_results refactor

* add comments

* pass all values to recursive _get_all_results()

* use a single results dict, not one at each level

* 1) Guard against missing attributes (just in case; I don't know if it's possible) 2) renamed var

* result object with id of parent_id should be included

* Non-existent return keys should be ignored; otehrs should not be ignored

* We don't catch all exceptions anymore, so change the test