remote-bzr: improve author sanitazion

So that we don't end up with '<None>', and also synchronize it with the
one from remote-hg.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/remote-helpers/git-remote-bzr

@@ -38,6 +38,7 @@ import atexit, shutil, hashlib, urlparse, subprocess
 
 NAME_RE = re.compile('^([^<>]+)')
 AUTHOR_RE = re.compile('^([^<>]+?)? ?<([^<>]*)>$')
+EMAIL_RE = re.compile('^([^<>]+[^ \\\t<>])?\\b(?:[ \\t<>]*?)\\b([^ \\t<>]+@[^ \\t<>]+)')
 RAW_AUTHOR_RE = re.compile('^(\w+) (.+)? <(.*)> (\d+) ([+-]\d+)')
 
 def die(msg, *args):
@@ -174,11 +175,21 @@ def fixup_user(user):
     if m:
         name = m.group(1)
         mail = m.group(2).strip()
+    else:
+        m = EMAIL_RE.match(user)
+        if m:
+            name = m.group(1)
+            mail = m.group(2)
         else:
             m = NAME_RE.match(user)
             if m:
                 name = m.group(1).strip()
 
+    if not name:
+        name = 'unknown'
+    if not mail:
+        mail = 'Unknown'
+
     return '%s <%s>' % (name, mail)
 
 def get_filechanges(cur, prev):