Add the ability to set actions to None in order to avoid admin actions choices
After a discussion with Jacob on irc:
<david`bgk> is there a way to disable admin actions or my admin will never be the same? :)
<jacobkm> david`bgk: that's a good point; actions = None should Do The Right Think.
<jacobkm> david`bgk: file a bug!
<david`bgk> jacobkm, no it must be an empty list
<jacobkm> david`bgk: no, I'm saying that we should modify actions so that "actions = None" means "don't put any actions on this page"
<jacobkm> won't be in the beta, but we can consider it a bug and fix it for the final release.
I'll try to submit a patch quickly.