remote-hg: another case of Postel's law

This change allows invalid input from Mercurial repositories where the
author is recorded as 'Name <email@blah' (missing the closing '>').

With this change, importing http://scelenic.com/hg itself no longer fails
with:

	fatal: Missing > in ident string: Benoit Boissinot
	<benoit.boissinot@ens-lyon.org <none@none> 1129685868 -0700

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

git_remote_helpers/hg/hg.py

@@ -76,17 +76,21 @@ class GitHg(object):
         author = ctx.user()
 
         # check for git author pattern compliance
-        regex = re.compile('^(.*?) ?\<(.*?)\>(.*)$')
+        regex = re.compile('^(.*?) ?\<(.*?)(|\>(.*))$')
         a = regex.match(author)
 
         if a:
             name = a.group(1)
             email = a.group(2)
-            if len(a.group(3)) > 0:
-                name += ' ext:(' + urllib.quote(a.group(3)) + ')'
+            extra = a.group(4)
+            if not extra is None and len(extra) > 0:
+                name += ' ext:(' + urllib.quote(extra) + ')'
             author = name + ' <' + email + '>'
         else:
-            author = author + ' <none@none>'
+            if author.find('<') >= 0:
+                author = author + '>'
+            else:
+                author = author + ' <none@none>'
 
         if 'author' in ctx.extra():
             author = apply_delta(author, ctx.extra()['author'])