Doesn't accept null value for max file size on Git hooks

CHANGELOG-EE

 v 8.4.0 (unreleased)
   - Add ability to create a note for user by admin
+  - Fix "Commit was rejected by git hook", when max_file_size was set null in project's Git hooks
 
 v 8.3.0
   - License information can now be retrieved via the API

app/models/git_hook.rb

@@ -2,6 +2,7 @@ class GitHook < ActiveRecord::Base
   belongs_to :project
 
   validates :project, presence: true, unless: "is_sample?"
+  validates :max_file_size, numericality: { greater_than_or_equal_to: 0, only_integer: true }
 
   def commit_validation?
     commit_message_regex.present? ||

db/migrate/20151228203337_change_max_file_size_to_not_null_on_git_hooks.rb

+class ChangeMaxFileSizeToNotNullOnGitHooks < ActiveRecord::Migration
+  def change
+    change_column_null :git_hooks, :max_file_size, false, 0
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20151215132013) do
+ActiveRecord::Schema.define(version: 20151228203337) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -400,7 +400,7 @@ ActiveRecord::Schema.define(version: 20151215132013) do
     t.boolean  "member_check",                     default: false, null: false
     t.string   "file_name_regex",      limit: 255
     t.boolean  "is_sample",                        default: false
-    t.integer  "max_file_size",                    default: 0
+    t.integer  "max_file_size",                    default: 0,     null: false
   end
 
   create_table "historical_data", force: :cascade do |t|

spec/models/git_hook_spec.rb

@@ -7,5 +7,6 @@ describe GitHook do
 
   describe "Validation" do
     it { should validate_presence_of(:project) }
+    it { should validate_numericality_of(:max_file_size).is_greater_than_or_equal_to(0).only_integer }
   end
 end