Issue Summary

Inconsistency was observed in the product behavior when retrieving Epic ID=0 via using UI, EI vs API 2.0.  The user is able to view the Epic ID=0 using the URL from the UI and the user is able to view the Epic ID=0 from the Enterprise Insights. 
However, when the user tries to get the same work item via REST API, the "HTTP-404 / Cannot get epic with id 0." error is received.

Steps to Reproduce

1. Go to JA UI and view the Epic ID=0 by using the URL https://<instance.name>jiraalign.com/rest/align/api/2/Epics/0
2. Verify the Epic ID=0 can be viewed in the slide-out panel as "Empty"
3. Try to cancel/delete the work item. The error states that it has been canceled or deleted but, no action seems to be performed on that record.
4. Try via the EI. The Epic ID=0 can be seen via EI. EI returns the value.
5. Try to Get the Epic ID=0 via the API. Error is seen HTTP-404 / Cannot get epic with id 0.

Expected Results

The results to be consisted of work item ID=0 using UI, EI, and API methods

Actual Results

Workaround

Currently, there is no known workaround for this behavior. A workaround will be added here when available