Comment 4 for bug 1808320

Looks like r18869 introduces a dependency on nonexistent file branchmergeproposal-update-diff.pt. Perhaps that was missed?

I have never built Launchpad before, but I encounter this error trying to run `make schema`, which seems like it may be related:

    ValueError: ('No such file', '~/launchpad/lp-branches/devel/lib/lp/code/browser/../templates/branchmergeproposal-update-diff.pt')