[Pkg-bazaar-maint] Bug#517869: print proper error if bzr mu can't find the pristine upstream branch

[Jelmer Vernooij]

Package: bzr-builddeb
Version: 2.0.1
Severity: normal

Right now "bzr merge-upstream" will print a confusing error if the
pristine upstream branch can't be found. It will simply print "ERROR: No such
tag: upstream-0.1.1" if the last upstream version in debian/changelog is
0.1.1. 

It would be nice if it could give the user a hint as to what is failing
exactly and how to fix it.

-- System Information:
Debian Release: squeeze/sid
  APT prefers oldstable
  APT policy: (500, 'oldstable'), (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.28-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages bzr-builddeb depends on:
ii  bzr                           1.12-1     easy to use distributed version co
ii  bzrtools                      1.12.0-1   Collection of tools for bzr
ii  devscripts                    2.10.46    scripts to make the life of a Debi
ii  dpkg-dev                      1.14.25    Debian package development tools
ii  fakeroot                      1.12.1     Gives a fake root environment
ii  patchutils                    0.3.1-1    Utilities to work with patches
ii  python                        2.5.4-2    An interactive high-level object-o
ii  python-apt                    0.7.9~exp2 Python interface to libapt-pkg
ii  python-central                0.6.11     register and build utility for Pyt
ii  python-debian                 0.1.12     Python modules to work with Debian

bzr-builddeb recommends no packages.

Versions of packages bzr-builddeb suggests:
ii  bzr-svn                       0.5.2-1    Bazaar plugin providing Subversion

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