hop-run.sh does not evaluate variables

The hop-run.sh tool does not evaluate variables (not even PROJECT_HOME). Things are working if these variables are declared with -p.

Background:

Our current project demand the development of the pipelines and workflows in an separate Windows environment. The productive environment does not have a GUI.

As such, we have to transfer the project directory from Windows to Linux, create a project under Linux and execute the pipelines and workflows via hop-run.sh

After some fiddling, we managed to get the workflows to run. We had to declare ALL variables via -p (incl. PROJECT_HOME)