CPConverter - error messages can be obfuscated

Currently, when performing a CPConversion, if the customer has wrong code, sometimes the exception can be very obfuscated.

This gives the customer no chance to fix their error easily:

In this example a xml file is empty:
[ERROR] Unable to convert content-package [/tmp/packages/???.ui.content-1.28.0-SNAPSHOT.zip, /tmp/packages/???.ui.apps-1.28.0-SNAPSHOT.zip]: Premature end of file.
We would like a path to be provided in the exception so the customer can take a look there.