Merge pull request #345 from CTPUG/bugs/fix_add_groups

Handle non-unique permissions the same as other permission errors, rather than breaking later

wafer/management/commands/wafer_add_default_groups.py

@@ -37,6 +37,7 @@ def add_wafer_groups(self):
                     continue
                 except Permission.MultipleObjectsReturned:
                     print('Non-unique permission %s' % perm_code)
+                    continue
                 if perm not in group.permissions.all():
                     print('Adding %s to %s' % (perm_code, wafer_group))
                     group.permissions.add(perm)