Merge pull request #1544 from alphagov/revert-is_letter_contact_blank

Revert adding the is_letter_contact_blank column.

migrations/versions/0155_revert_0153.py

@@ -0,0 +1,20 @@
+"""
+
+Revision ID: 0155_revert_0153
+Revises: 0154_nullable_is_blank
+Create Date: 2018-01-05 14:09:21.200102
+
+"""
+from alembic import op
+
+revision = '0155_revert_0153'
+down_revision = '0154_nullable_is_blank'
+
+
+def upgrade():
+    op.drop_column('templates', 'is_letter_contact_blank')
+    op.drop_column('templates_history', 'is_letter_contact_blank')
+
+
+def downgrade():
+    pass