Commented Unassigned: [4.0.3] Unhandled exception in ExcelRange.Copy with merged cells [15200]

Tying to execute ExcelRange.Copy on range with merged cells result in exception "Can't merge and already merged range".

Example code attached.
Comments: This problem is still not solved completely in build [59920b4b5f9f](https://epplus.codeplex.com/SourceControl/changeset/59920b4b5f9f). I added a new [issue 15234](https://epplus.codeplex.com/workitem/15234).