Merge branch 'ew/svn-fixes' into maint

Meant eventually for 'maint'.

* ew/svn-fixes:
  git-svn: document useLogAuthor and addAuthorFrom config keys
  git-svn: allow "0" in SVN path components

Documentation/git-svn.txt

@@ -664,13 +664,19 @@ creating the branch or tag.
 	When retrieving svn commits into Git (as part of 'fetch', 'rebase', or
 	'dcommit' operations), look for the first `From:` or `Signed-off-by:` line
 	in the log message and use that as the author string.
++
+[verse]
+config key: svn.useLogAuthor
+
 --add-author-from::
 	When committing to svn from Git (as part of 'commit-diff', 'set-tree' or 'dcommit'
 	operations), if the existing log message doesn't already have a
 	`From:` or `Signed-off-by:` line, append a `From:` line based on the
 	Git commit's author string.  If you use this, then `--use-log-author`
 	will retrieve a valid author string for all commits.
-
++
+[verse]
+config key: svn.addAuthorFrom
 
 ADVANCED OPTIONS
 ----------------

perl/Git/SVN/Ra.pm

@@ -606,7 +606,7 @@ sub minimize_url {
 			my $latest = $ra->get_latest_revnum;
 			$ra->get_log("", $latest, 0, 1, 0, 1, sub {});
 		};
-	} while ($@ && ($c = shift @components));
+	} while ($@ && defined($c = shift @components));
 
 	return canonicalize_url($url);
 }