Set missing stages on ci builds to 'test' to avoid regressions in the pipelines view

db/migrate/20160615191922_set_missing_stage_on_ci_builds.rb

+class SetMissingStageOnCiBuilds < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  def up
+    update_column_in_batches(:ci_builds, :stage, :test) do |table, query|
+      query.where(table[:stage].eq(nil))
+    end
+  end
+end