not reporting merged revision correctly

[Martin Mrazik]

For example in this merge progposal:
https://code.launchpad.net/~vanvugt/mir/fix-1191636/+merge/169715
Linked to this bug:
https://bugs.launchpad.net/mir/+bug/1191636

There is this message in the bug report:
Fix committed into lp:mir at revision None, scheduled for release in mir, milestone 0.0.4

AFAICT this is some timing issue. The jenkins-launchpad-plugin has the following code:

message = message.format(
target=mp.target_branch.display_name,
revision=mp.merged_revno,
project=project.name,
milestone=milestone_name)

When I retrospectively checked mp.merged_revno it was correctly set. I fear it takes some time until launchpad detects the merge and updates the internal structures.