Revert "comment out theme-checksum migration"

This reverts commit 2145b97d44.

migrations/596-theme-checksums.py

@@ -1,12 +1,12 @@
 #!/usr/bin/env python
 
-# from addons.models import Persona
-# from addons.tasks import calc_checksum
-# from amo.utils import chunked
+from addons.models import Persona
+from addons.tasks import calc_checksum
+from amo.utils import chunked
 
 
-# def run():
-#     """Calculate checksums for all themes."""
-#     pks = Persona.objects.filter(checksum='').values_list('id', flat=True)
-#     for chunk in chunked(pks, 1000):
-#         [calc_checksum.delay(pk) for pk in chunk]
+def run():
+    """Calculate checksums for all themes."""
+    pks = Persona.objects.filter(checksum='').values_list('id', flat=True)
+    for chunk in chunked(pks, 1000):
+        [calc_checksum.delay(pk) for pk in chunk]