Description
Steps to reproduce (step by step instructions, with links, commands and necessary data to reproduce the error)
- define a Z8 as a composition, but set Z14K2 to an empty object {}
- call that Z8
Observed behavior
- result will be undefined
Expected behavior/Acceptance criteria (returned value, expected error, performance expectations, etc.)
- result should be some kind of Z5
Completion checklist
- Before closing this task, review one by one the checklist available here: https://www.mediawiki.org/wiki/Abstract_Wikipedia_team/Definition_of_Done#Back-end_Task/Bug_completion_checklist