@@ -29,6 +29,10 @@ declare -A -g PROJECT_VENV

 # get_pip_command

 function get_pip_command {

     local version="$1"

+    if [ -z "$version" ]; then

+        die $LINENO "pip python version is not set."

+    fi

+

     # NOTE(dhellmann): I don't know if we actually get a pip3.4-python

     # under any circumstances.

     which pip${version} || which pip${version}-python