Merge pull request #11236 from edx/peter-fogg/fix-course-mode-migration

Change broken course_modes migration to not touch the database.

common/djangoapps/course_modes/migrations/0005_auto_20151217_0958.py

@@ -11,6 +11,9 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        migrations.SeparateDatabaseAndState(
+            database_operations=[],
+            state_operations=[
                     migrations.RemoveField(
                         model_name='coursemode',
                         name='expiration_datetime',
@@ -21,3 +24,5 @@ class Migration(migrations.Migration):
                         field=models.DateTimeField(db_column=b'expiration_datetime', default=None, blank=True, help_text='OPTIONAL: After this date/time, users will no longer be able to enroll in this mode. Leave this blank if users can enroll in this mode until enrollment closes for the course.', null=True, verbose_name='Upgrade Deadline'),
                     ),
             ]
+        )
+    ]