email: Ignore suspended LP people

We were looking at ~python-modules-team, which is suspended and raises a
HTTPError that wasn't being caught.

britney2/policies/email.py

@@ -5,6 +5,7 @@ import math
 import socket
 import smtplib
 
+from urllib.error import HTTPError
 from urllib.parse import unquote
 from collections import defaultdict
 
@@ -117,6 +118,7 @@ class EmailPolicy(BasePolicy, Rest):
         if person in self.addresses:
             return self.addresses[person]
         addresses = []
+        try:
             gpg = self.query_lp_rest_api(person + '/gpg_keys', {})
             for key in gpg['entries']:
                 details = self.query_rest_api('http://keyserver.ubuntu.com/pks/lookup', {
@@ -140,10 +142,16 @@ class EmailPolicy(BasePolicy, Rest):
                             addresses.append(match.group(1))
             address = self.addresses[person] = address_chooser(addresses)
             return address
+        except HTTPError as e:
+            if e.code != 410:  # suspended user
+                raise
+            self.log('Ignoring person %s as suspended in Launchpad' % person)
+            return None
 
     def scrape_gpg_emails(self, people):
         """Find email addresses from GPG keys."""
-        return [self._scrape_gpg_emails(person) for person in (people or [])]
+        emails = [self._scrape_gpg_emails(person) for person in (people or [])]
+        return [email for email in emails if email is not None]
 
     def lp_get_emails(self, pkg, version):
         """Ask LP who uploaded this package."""