Comment 5 for bug 252259

Any chance you can run the following in a python interpreter:

from bzrlib.plugin import load_plugins
load_plugins()
from bzrlib.plugins.svn.branch import SvnBranch

Also, does loading bzr-search still fail if you remove the section around line 154:

 try:
        from bzrlib.plugins.svn.branch import SvnBranch
    except ImportError:
        SvnBranch = None