lisa_shell: Check PYTHONPATH
Warn if PYTHONPATH is not empty, since it can interfere with venv. In the worst case, it can lead to using a wrong version of e.g. bart that would be installed somewhere else, leading to strange failures in LISA.
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Warn if PYTHONPATH is not empty, since it can interfere with venv. In the worst case, it can lead to using a wrong version of e.g. bart that would be installed somewhere else, leading to strange failures in LISA.