This fixes the case of bash: PS1: unbound variable when PYENV_VIRTUALENV_DISABLE_PROMPT isn't set.
This should have been part of #423, sorry for that. I also fixed the tests related to virtualenv activation/deactivation which were failing due to my changes.
This fixes the case of
bash: PS1: unbound variable
whenPYENV_VIRTUALENV_DISABLE_PROMPT
isn't set. This should have been part of #423, sorry for that. I also fixed the tests related to virtualenv activation/deactivation which were failing due to my changes.