olive push raises error but works

[Jasper Groenewegen]

olive push raises error on remote (workingtree-less) branches since bzrlib pull doesn't return an int anymore.

push.py do_push function:
If a working tree is present, 'count = tree_to.pull(br_from, overwrite)' and tree_to is a WorkingTree
If no working tree present, 'count = br_to.pull(br_from, overwrite)' and br_to is a (remote) branch. bzrlib.branch.Branch/bzrlib.remote.RemoteBranch don't return an int anymore.

[Jasper Groenewegen (colbrac)]

Fix send to list

[Curtis Hovey (sinzui)]

I have a branch in review that partially addresses this issue. The real fix will be in a subsequent branch that will use the PullResult.