save result only for python-actions that returns a string.
save result only for python-actions that returns a string.

--HG--
extra : convert_revision : eduardo%40eduardo-20091030030336-9mva9x55bq1mrmvw

lelit/doit,pydoit/doit,Hinidu/doit,gh0std4ncer/doit,lelit/doit,JohannesBuchner/doit,saimn/doit,lelit/doit,lelit/doit,wangpanjun/doit