added another unit test check point for export/import of classic textbooks

cms/djangoapps/contentstore/tests/test_contentstore.py

@@ -226,7 +226,7 @@ class ContentStoreToyCourseTest(ModuleStoreTestCase):
         module_store = modulestore('direct')
         course = module_store.get_item(Location(['i4x', 'edX', 'full', 'course', '6.002_Spring_2012', None]))
 
-        self.assertGreater(len(course.textbooks), 0)
+        self.assertGreater(len(course.textbooks), 0)     
 
     def test_static_tab_reordering(self):
         import_from_xml(modulestore(), 'common/test/data/', ['full'])
@@ -498,6 +498,11 @@ class ContentStoreToyCourseTest(ModuleStoreTestCase):
 
         self.assertTrue(getattr(test_private_vertical, 'is_draft', False))
 
+        # make sure the textbook survived the export/import
+        course = module_store.get_item(Location(['i4x', 'edX', 'full', 'course', '6.002_Spring_2012', None]))
+
+        self.assertGreater(len(course.textbooks), 0)
+
         shutil.rmtree(root_dir)
 
     def test_course_handouts_rewrites(self):

common/lib/xmodule/xmodule/course_module.py

@@ -392,7 +392,7 @@ class CourseDescriptor(CourseFields, SequenceDescriptor):
                 textbook_xml_object.set('book_url', textbook.book_url)
 
             xml_object.append(textbook_xml_object)
-
+        
         return xml_object
 
     def has_ended(self):