Add tests for passing nil values in epics and packages
In #215936 (closed), we found that
upgrading to Grape v1.3.2 caused a regression in our QA suite because
passing a nil
value for an Array type would be passed in as a nil
value instead of being coerced to an empty Array. We had to revert the
upgrade as a result. To ensure that nil
values are handled properly on
the backend, add tests for this.
Edited by Stan Hu