Description

Steps to reproduce (step by step instructions, with links, commands and necessary data to reproduce the error)

1. Call the function setMetadataValue with a degenerate object, e.g. Z22 = setMetadataValue( Z22, { 'Z1K1: 'Z6', Z6K1: 'key' }, { 'Z1K1: 'Z6', 'Z6K1': undefined } )

Observed behavior

• the resulting Pair will look like { 'Z1K1': {...}, 'K1': { 'Z1K1': 'Z6', 'Z6K1': 'key' }, 'K2': { 'Z1K1': 'Z6' } }

Expected behavior/Acceptance criteria (returned value, expected error, performance expectations, etc.)

• setMetadataValue should raise an error or otherwise indicate that the input was not a valid ZObject

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