[PATCH STABLE] push: fix "No changes found" when pushing a phase change (issue4232)

[timeless]

Matt Mackall wrote:
> I think the message should be "adjusting phases" (full stop). On push, sometimes
> we simply local draft changes public (so nothing is actually pushed).

> (We're also eerily silent for 20 seconds while synchronizing obsmarkers.)

fwiw, if you talk to bitbucket, you don't get that.

I got things like:
obsmarkers exchange [=====================================> ]
8861194/14391223 6m37s

(where the number climbed for a really long time.
2016/01/21 19:07:14 timeless (126481)> push bitbucket -r tip exited 0
after 1554.39 seconds

Laurent Charignon wrote:
> What do you mean by "full stop"?

You have:
no new changesets, only pushing phase changes
mpm is suggesting:
adjusting phases

nothing else, no mention of `no new changesets` or `pushing` or `changes`.