First of all,  ```set -e```
so if ```$? -ne 0``` this will kill the script.

Moreover for this we must rework the whole script. This is not checked after any whiptail line. Even worse: We don't check for strings that only contains spaces. We don't check for the domains "chain", "tools", etc. which are program directories.

Later I may fix this but I want to give the tool to a customer so in this place I only need foreign OUs.