scripts: Fix setup_env.py --cache when CONDUIT is not set.
scripts: Fix setup_env.py --cache when CONDUIT is not set.

StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion