Merge lp:~mbp/bzr-search/627202-valueerror into lp:bzr-search

[Martin Pool]

https://bugs.launchpad.net/ubuntu/+source/bzr-search/+bug/627202

Several people report bzr crashes when bzr-search is installed, because of evaluating log(0) here.

I see this is because of reindexing a repository with no revisions, but in the time I spent, I could not work out how to reproduce that. So this just tries to guard against that case.

=== modified file 'index.py'
--- index.py	2010-12-14 14:02:13 +0000
+++ index.py	2011-02-01 04:24:08 +0000
@@ -442,7 +442,7 @@
         if not allow_pack:
             return
         total_revisions = self._revision_index.key_count()
-        max_components = int(math.ceil(math.log(total_revisions, 2)))
+        max_components = int(math.ceil(math.log(max(1, total_revisions), 2)))
         if max_components < 1:
             max_components = 1
         excess = len(self._current_names) - max_components