The projects path was being handed off to get_config in GMrecordsApp which meant that none of the project-specific configs were being found and so they were not getting used.
When assemble fails, the _assemble_event method returns the event object rather than the workspace file name, which caused an error when _summarize_files_created is called, rather than exiting gracefully.
get_configinGMrecordsAppwhich meant that none of the project-specific configs were being found and so they were not getting used._assemble_eventmethod returns the event object rather than the workspace file name, which caused an error when_summarize_files_createdis called, rather than exiting gracefully.