node.py: sanitize project_id and avoid creating an implicit cursor
node.py: sanitize project_id and avoid creating an implicit cursor

htem/CATMAID,fzadow/CATMAID,htem/CATMAID,fzadow/CATMAID,fzadow/CATMAID,htem/CATMAID,htem/CATMAID,fzadow/CATMAID