Rescue from ActiveRecord::UnknownAttributeError and fallback to fake settings

Signed-off-by: Rémy Coutable <remy@rymai.me>

lib/gitlab/current_settings.rb

@@ -30,15 +30,15 @@ module Gitlab
     end
 
     def in_memory_application_settings
-      @in_memory_application_settings ||= ApplicationSetting.new(ApplicationSetting::DEFAULTS)
+      @in_memory_application_settings ||= ::ApplicationSetting.new(::ApplicationSetting::DEFAULTS)
     # In case migrations the application_settings table is not created yet,
     # we fallback to a simple OpenStruct
-    rescue ActiveRecord::StatementInvalid
+    rescue ActiveRecord::StatementInvalid, ActiveRecord::UnknownAttributeError
       fake_application_settings
     end
 
     def fake_application_settings
-      OpenStruct.new(ApplicationSetting::DEFAULTS)
+      OpenStruct.new(::ApplicationSetting::DEFAULTS)
     end
 
     private

lib/gitlab/import_sources.rb

@@ -5,8 +5,6 @@
 #
 module Gitlab
   module ImportSources
-    extend CurrentSettings
-
     ImportSource = Struct.new(:name, :title, :importer)
 
     ImportTable = [