Eagerly load all modules when reading the course from xml, so that users who are…

Eagerly load all modules when reading the course from xml, so that users who are already on a problem page can check their answers

lms/envs/common.py

@@ -144,6 +144,7 @@ MODULESTORE = {
         'OPTIONS': {
             'data_dir': DATA_DIR,
             'default_class': 'xmodule.hidden_module.HiddenDescriptor',
+            'eager': True,
         }
     }
 }