When fill_in_run() fails, handle failure instead of exception.

common/lib/xmodule/xmodule/modulestore/mongo/base.py

@@ -1486,9 +1486,16 @@ class MongoModuleStore(ModuleStoreDraftAndPublished, ModuleStoreWriteBase, Mongo
         # Using the course_key, find or insert the course asset metadata document.
         # A single document exists per course to store the course asset metadata.
         course_key = self.fill_in_run(course_key)
-        course_assets = self.asset_collection.find_one(
-            {'course_id': unicode(course_key)},
-        )
+        if course_key.run is None:
+            log.warning(u'No run found for combo org "{}" course "{}" on asset request.'.format(
+                course_key.org, course_key.course
+            ))
+            course_assets = None
+        else:
+            # Complete course key, so query for asset metadata.
+            course_assets = self.asset_collection.find_one(
+                {'course_id': unicode(course_key)},
+            )
 
         doc_id = None if course_assets is None else course_assets['_id']
         if course_assets is None:
@@ -1607,9 +1614,7 @@ class MongoModuleStore(ModuleStoreDraftAndPublished, ModuleStoreWriteBase, Mongo
             dest_course_key (CourseKey): identifier of course to copy to
         """
         source_assets = self._find_course_assets(source_course_key)
-        dest_assets = {'assets': source_assets.asset_md.copy()}
-        dest_assets['course_id'] = unicode(dest_course_key)
-
+        dest_assets = {'assets': source_assets.asset_md.copy(), 'course_id': unicode(dest_course_key)}
         self.asset_collection.remove({'course_id': unicode(dest_course_key)})
         # Update the document.
         self.asset_collection.insert(dest_assets)

common/lib/xmodule/xmodule/modulestore/tests/test_mongo.py

@@ -29,7 +29,7 @@ from xmodule.modulestore import ModuleStoreEnum
 from xmodule.modulestore.mongo import MongoKeyValueStore
 from xmodule.modulestore.draft import DraftModuleStore
 from opaque_keys.edx.locations import SlashSeparatedCourseKey, AssetLocation
-from opaque_keys.edx.locator import LibraryLocator
+from opaque_keys.edx.locator import LibraryLocator, CourseLocator
 from opaque_keys.edx.keys import UsageKey
 from xmodule.modulestore.xml_exporter import export_to_xml
 from xmodule.modulestore.xml_importer import import_from_xml, perform_xlint
@@ -42,6 +42,8 @@ from xmodule.x_module import XModuleMixin
 from xmodule.modulestore.mongo.base import as_draft
 from xmodule.modulestore.tests.mongo_connection import MONGO_PORT_NUM, MONGO_HOST
 from xmodule.modulestore.edit_info import EditInfoMixin
+from xmodule.modulestore.exceptions import ItemNotFoundError
+
 
 log = logging.getLogger(__name__)
 
@@ -701,6 +703,11 @@ class TestMongoModuleStoreWithNoAssetCollection(TestMongoModuleStore):
         # Confirm that no specified asset collection name means empty asset metadata.
         self.assertEquals(self.draft_store.get_all_asset_metadata(course.id, 'asset'), [])
 
+    def test_no_asset_invalid_key(self):
+        course_key = CourseLocator(org="edx3", course="test_course", run=None, deprecated=True)
+        # Confirm that invalid course key raises ItemNotFoundError
+        self.assertRaises(ItemNotFoundError, lambda: self.draft_store.get_all_asset_metadata(course_key, 'asset')[:1])
+
 
 class TestMongoKeyValueStore(object):
     """