Fix #379, Enum with 0 value not shown on Example#452

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njqdev wants to merge 3 commits intocommandlineparser:developfrom

njqdev:enum-issue-379

Commits on Jun 1, 2019

Add test for issue
njqdev
committed
Bug fix
njqdev
committed

Commits on Jun 11, 2019

Include only required value types with default value
njqdev
committed