Add blank=True to rerun state display name

common/djangoapps/course_action_state/migrations/0002_add_rerun_display_name.py

@@ -10,7 +10,7 @@ class Migration(SchemaMigration):
     def forwards(self, orm):
         # Adding field 'CourseRerunState.display_name'
         db.add_column('course_action_state_coursererunstate', 'display_name',
-                      self.gf('django.db.models.fields.CharField')(default='', max_length=255),
+                      self.gf('django.db.models.fields.CharField')(default='', max_length=255, blank=True),
                       keep_default=False)
 
 

common/djangoapps/course_action_state/models.py

@@ -110,7 +110,7 @@ class CourseRerunState(CourseActionUIState):
     source_course_key = CourseKeyField(max_length=255, db_index=True)
 
     # Display name for destination course
-    display_name = models.CharField(max_length=255, default="")
+    display_name = models.CharField(max_length=255, default="", blank=True)
 
     # MANAGERS
     # Override the abstract class' manager with a Rerun-specific manager that inherits from the base class' manager.