More test fixes

Fix opaque key TODOs left over from split-migrator changes and fixed test_image_import to use the correct course

Reset get_location_from_path to pre deprecated opaque-keys

Fix CMS acceptance test

Fixed usage key reassignment in item.py

cms/djangoapps/contentstore/features/course-export.py

@@ -54,6 +54,10 @@ def i_click_on_error_dialog(step):
     course_key = SlashSeparatedCourseKey("MITx", "999", "Robot_Super_Course")
     # we don't know the actual ID of the vertical. So just check that we did go to a
     # vertical page in the course (there should only be one).
-    vertical_usage_key = course_key.make_usage_key("vertical", "")
+    vertical_usage_key = course_key.make_usage_key("vertical", None)
     vertical_url = reverse_usage_url('unit_handler', vertical_usage_key)
+    # Remove the trailing "/None" from the URL - we don't know the course ID, so we just want to
+    # check that we visited a vertical URL.
+    if vertical_url.endswith("/None"):
+        vertical_url = vertical_url[:-5]
     assert_equal(1, world.browser.url.count(vertical_url))

cms/djangoapps/contentstore/tests/test_contentstore.py

@@ -1479,7 +1479,7 @@ class ContentStoreTest(ContentStoreTestCase):
         content_store = contentstore()
 
         # Use conditional_and_poll, as it's got an image already
-        import_from_xml(
+        __, courses = import_from_xml(
             self.store,
             self.user.id,
             'common/test/data/',
@@ -1487,7 +1487,7 @@ class ContentStoreTest(ContentStoreTestCase):
             static_content_store=content_store
         )
 
-        course = self.store.get_courses()[0]
+        course = courses[0]
 
         # Make sure the course image is set to the right place
         self.assertEqual(course.course_image, 'images_course_image.jpg')

cms/djangoapps/contentstore/views/item.py

@@ -318,11 +318,11 @@ def _save_item(user, usage_key, data=None, children=None, metadata=None, nullout
         data = old_content['data'] if 'data' in old_content else None
 
     if children is not None:
-        children_usage_keys = [
-            UsageKey.from_string(child)
-            for child
-            in children
-        ]
+        children_usage_keys = []
+        for child in children:
+            child_usage_key = UsageKey.from_string(child)
+            child_usage_key = child_usage_key.replace(course_key=modulestore().fill_in_run(child_usage_key.course_key))
+            children_usage_keys.append(child_usage_key)
         existing_item.children = children_usage_keys
 
     # also commit any metadata which might have been passed along