do not import invalid emails, first/last date

import_padma.py

@@ -65,6 +65,8 @@ for u in users:
     username = u['username'].strip().lower()
     user, created = User.objects.get_or_create(username=username)
     user.email = u['email']
+    if not '@' in user.email:
+        user.email = ''
     user.password = u['password']
     user.date_joined = datetime.strptime(u['created'], '%Y-%m-%dT%H:%M:%SZ')
     user.save()
@@ -78,7 +80,8 @@ for u in users:
         s = SessionData()
         s.user = user
         s.session_key = hashlib.sha1(user.username).hexdigest()
-        s.firstseen = s.lastseen = user.date_joined
+        s.lastseen = user.date_joined
+        s.firstseen = user.date_joined
         s.timesseen = 1
         s.save()
     for g in u['groups']: