Fixed pip/python report error after `source greenplum_path.sh`
If no python in $GPHOME/ext/python/bin/python, $PYTHONHOME will be set
to empty string, which make python env wrong.
@@ -44,6 +44,7 @@ cat <<EOF
#setup PYTHONHOME
if [ -x \$GPHOME/ext/python/bin/python ]; then
PYTHONHOME="\$GPHOME/ext/python"
+ export PYTHONHOME
fi
EOF
@@ -100,6 +101,5 @@ EOF
cat <<EOF
export PYTHONPATH
-export PYTHONHOME
EOF
