actually ignore stderr of 'pip list' in det_installed_python_packages function provided by Python easyblock#3731

lexming merged 1 commit intoeasybuilders:developeasybuilders/easybuild-easyblocks:developfrom

boegel:fix_det_installed_python_packagesboegel/easybuild-easyblocks:fix_det_installed_python_packagesCopy head branch name to clipboard