I did further investigations on 'broken' input files and placed a related issue
https://github.com/MakarovS96/cache-tort-git/issues/8
It happened a little bit by accident but I found this a possible realistic scenario that explains
why the problem occurs every now and then.  You may argue this is bad handling by user.
Accepted. But not unlikely.

I found this situation:

  • I have a project. with several packages and classes
  • I deleted a class BUT the PACKAGE was not saved and didn't reflect the change
  • From ClassMethod ExportProject(project ,1) I get this strange XML for the deleted class c:\temp\TEST\dc\MyCompany\EmployeRegister1.cls.xml <?xml version="1.0" encoding="UTF-8"?> <Export generator="IRIS" version="26"> </Export>
  • now I need a GIT expert to analyze what happens with this incomplete input.
  • my assumption: according to the file name there is an empty entry of type CLS named /dc/MyCompany/EmployeRegister1.cls.xml or similar
  • when ist is restored it may cause the described problem togehter with the reported bug in $system.OBJ.Load() 

Finally, the docker image now builds OK and contains all required classes & all globals.
( + also the bug in dc.script.Genre.cls was fixed) 
Connection to local PowerBi now works and shows the expected images.
Thanks for fixing it.

I was somewhat surprised that IRIS Analytics was not required at all since there
was no Cube nor Pivot nor Dashboard. I built it myself just using dc.dc.bi.PopSongs.

OK. PowerBI graphics look better.
But here is not the place to comment on ZEN graphics.