Changes from pull request comments.

common/lib/xmodule/xmodule/x_module.py

@@ -306,7 +306,7 @@ class XModuleDescriptor(Plugin, HTMLSnippet):
     module_class = XModule
     
     # Attributes for inpsection of the descriptor
-    stores_state = False # Indicates wether the xmodule state should be 
+    stores_state = False # Indicates whether the xmodule state should be 
     # stored in a database (independent of shared state)
     has_score = False # This indicates whether the xmodule is a problem-type.
     # It should respond to max_score() and grade(). It can be graded or ungraded

lms/djangoapps/courseware/grades.py

@@ -185,7 +185,7 @@ def get_score(user, problem, student_module_cache):
     problem: an XModule
     cache: A StudentModuleCache
     """
-    if not problem.descriptor.stores_state or not problem.descriptor.has_score:
+    if not (problem.descriptor.stores_state and problem.descriptor.has_score):
         # These are not problems, and do not have a score
         return (None, None)