Allow null for protected attribute in ci_pipelines

db/migrate/20170731132235_add_protected_to_ci_pipelines.rb

@@ -6,7 +6,7 @@ class AddProtectedToCiPipelines < ActiveRecord::Migration
   disable_ddl_transaction!
 
   def up
-    add_column_with_default(:ci_pipelines, :protected, :boolean, default: false)
+    add_column(:ci_pipelines, :protected, :boolean)
   end
 
   def down

db/schema.rb

@@ -336,7 +336,7 @@ ActiveRecord::Schema.define(version: 20170824162758) do
     t.integer "auto_canceled_by_id"
     t.integer "pipeline_schedule_id"
     t.integer "source"
-    t.boolean "protected", default: false, null: false
+    t.boolean "protected"
   end
 
   add_index "ci_pipelines", ["auto_canceled_by_id"], name: "index_ci_pipelines_on_auto_canceled_by_id", using: :btree