go.sh: Remove fail in existing venv & fix check for ICEKit venv path

project_template/go.sh

@@ -8,20 +8,14 @@ EOF
 
 set -e
 
-# Detect if this script is run within an existing virtualenv and abort
-if [[ $VIRTUAL_ENV ]]; then
-    echo "ERROR: $0 will not work properly if run inside a venv; deactivate '`basename $VIRTUAL_ENV`'"
-    exit 1
-fi
-
 # Get absolute project directory from the location of this script.
 # See: http://stackoverflow.com/a/4774063
 export ICEKIT_PROJECT_DIR=$(cd $(dirname "${BASH_SOURCE[0]}"); pwd -P)
 
 export ICEKIT_VENV="$ICEKIT_PROJECT_DIR/var/venv-icekit-dev"
 
 # Create local (non-Docker) virtualenv.
-if [[ ! -d "$ICEKIT_VENV/bin/pip" ]]; then
+if [[ ! -d "$ICEKIT_VENV" ]]; then
     virtualenv "$ICEKIT_VENV"
 fi