Fixed unary operator warning

start.sh

@@ -27,8 +27,8 @@ echo Running migrations
 python manage.py makemigrations
 python manage.py migrate
 
-if [ $1 = "--create-default-pnode" ]; then
+if [[ $1 = "--create-default-pnode" ]]; then
    echo "from nodeodm.models import ProcessingNode; ProcessingNode.objects.update_or_create(hostname='node-odm-1', defaults={'hostname': 'node-odm-1', 'port': 3000})" | python manage.py shell
 fi
 
-python manage.py runserver 0.0.0.0:8000
+python manage.py runserver 0.0.0.0:8000