Do not allow users without email to edit translations

We need this for VCS commits.
Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/accounts/models.py

@@ -29,6 +29,7 @@ from django.db import models
 from django.dispatch import receiver
 from django.conf import settings
 from django.contrib.auth.signals import user_logged_in, user_logged_out
+from django.contrib import messages
 from django.db.models.signals import post_save, post_migrate
 from django.utils.translation import ugettext_lazy as _
 from django.utils.encoding import python_2_unicode_compatible, force_text
@@ -863,6 +864,16 @@ def post_login_handler(sender, request, user, **kwargs):
     # Set language for session based on preferences
     set_lang(request, profile)
 
+    # Warn about not set email
+    if not user.email:
+        messages.error(
+            request,
+            _(
+                'You can not submit translations as '
+                'you do not have assigned any email address.'
+            )
+        )
+
 
 @receiver(user_logged_out)
 def post_logout_handler(sender, request, user, **kwargs):

weblate/trans/permissions.py

@@ -121,6 +121,8 @@ def can_edit(user, translation, permission):
     """
     if translation.subproject.locked:
         return False
+    if not user.email:
+        return False
     if check_owner(user, translation.subproject.project, permission):
         return True
     if not has_group_perm(user, permission, translation):