clean up some pylint violations

cms/djangoapps/models/settings/course_metadata.py

@@ -10,7 +10,7 @@ class CourseMetadata(object):
     '''
     # __new_advanced_key__ is used by client not server; so, could argue against it being here
     FILTERED_LIST = XModuleDescriptor.system_metadata_fields + ['start', 'end', 'enrollment_start', 'enrollment_end', 'tabs', 'graceperiod', '__new_advanced_key__']
-    
+
     @classmethod
     def fetch(cls, course_location):
         """
@@ -18,17 +18,17 @@ class CourseMetadata(object):
         """
         if not isinstance(course_location, Location):
             course_location = Location(course_location)
-            
+
         course = {}
-        
+
         descriptor = get_modulestore(course_location).get_item(course_location)
-        
+
         for k, v in descriptor.metadata.iteritems():
             if k not in cls.FILTERED_LIST:
                 course[k] = v
-                
+    
         return course
-        
+
     @classmethod
     def update_from_json(cls, course_location, jsondict):
         """
@@ -37,7 +37,7 @@ class CourseMetadata(object):
         Ensures none of the fields are in the blacklist.
         """
         descriptor = get_modulestore(course_location).get_item(course_location)
-        
+
         dirty = False
 
         for k, v in jsondict.iteritems():
@@ -45,26 +45,26 @@ class CourseMetadata(object):
             if k not in cls.FILTERED_LIST and (k not in descriptor.metadata or descriptor.metadata[k] != v):
                 dirty = True
                 descriptor.metadata[k] = v
-            
+
         if dirty:
             get_modulestore(course_location).update_metadata(course_location, descriptor.metadata)
-            
+
         # Could just generate and return a course obj w/o doing any db reads, but I put the reads in as a means to confirm
         # it persisted correctly
         return cls.fetch(course_location)
-    
+
     @classmethod
     def delete_key(cls, course_location, payload):
         '''
         Remove the given metadata key(s) from the course. payload can be a single key or [key..]
         '''
         descriptor = get_modulestore(course_location).get_item(course_location)
-        
+
         for key in payload['deleteKeys']:
             if key in descriptor.metadata:
                 del descriptor.metadata[key]
-    
+
         get_modulestore(course_location).update_metadata(course_location, descriptor.metadata)
-        
+
         return cls.fetch(course_location)