Exception when copying ExcelConnectionShape

[TimSalomons]

EPPlus usage

Noncommercial use

Environment

Windows

Epplus version

8.4.2

Spreadsheet application

Excel

Description

Whenever copying connection shapes from one Excel to another it raises a null reference exception.

`this` is not an ExcelShape when casted to one and so the variable remains null

I have created a minimal repo which includes an input Excel with the problematic shape:
Repo Link

[karlkallman]

Hello @TimSalomons . Thanks for reporting this bug. I've added a fix for it.