{"action":"created","comment":{"url":"https://api.github.com/repos/edx/edx-platform/pulls/comments/25266853","id":25266853,"diff_hunk":"@@ -279,6 +279,69 @@ def _is_in_bulk_operation(self, course_key, ignore_case=False):\n         return self._get_bulk_ops_record(course_key, ignore_case).active\n \n \n+class UnsetValueError(Exception):\n+    \"\"\"\n+    Throw this when accessing an unset value.\n+    \"\"\"\n+    pass\n+\n+\n+class UnsetValue(object):\n+    \"\"\"\n+    Simple class which supports an \"unset\" value as well as None and non-None values.\n+    \"\"\"\n+    def __init__(self, value=None, valid=False):\n+        self._value = value\n+        self.valid = valid\n+\n+    @property\n+    def value(self):\n+        \"\"\"\n+        Getter for the value. Raises UnsetValueError if value is unset.\n+        \"\"\"\n+        if self.valid:\n+            return self._value\n+        else:\n+            raise UnsetValueError()\n+\n+    @value.setter\n+    def value(self, value):\n+        \"\"\"\n+        Setter for the value. Also marks the value as valid.\n+        \"\"\"\n+        self._value = value\n+        self.valid = True","path":"common/lib/xmodule/xmodule/modulestore/__init__.py","position":35,"original_position":35,"commit_id":"d63002755d2c931eed5e7f38b9549fef44f8dd40","original_commit_id":"d63002755d2c931eed5e7f38b9549fef44f8dd40","user":{"login":"cpennington","id":30236,"avatar_url":"https://avatars.githubusercontent.com/u/30236?v=3","gravatar_id":"","url":"https://api.github.com/users/cpennington","html_url":"https://github.com/cpennington","followers_url":"https://api.github.com/users/cpennington/followers","following_url":"https://api.github.com/users/cpennington/following{/other_user}","gists_url":"https://api.github.com/users/cpennington/gists{/gist_id}","starred_url":"https://api.github.com/users/cpennington/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/cpennington/subscriptions","organizations_url":"https://api.github.com/users/cpennington/orgs","repos_url":"https://api.github.com/users/cpennington/repos","events_url":"https://api.github.com/users/cpennington/events{/privacy}","received_events_url":"https://api.github.com/users/cpennington/received_events","type":"User","site_admin":false},"body":"A pattern we've used for this in other places is somewhat simpler:\r\n\r\n    UNSET = object()  # This guarantees that it UNSET == UNSET, but doesn't == anything else\r\n\r\nAnd then you can check `is UNSET` to find out if a value is unset or not.","created_at":"2015-02-24T16:33:27Z","updated_at":"2015-02-24T16:33:27Z","html_url":"https://github.com/edx/edx-platform/pull/7075#discussion_r25266853","pull_request_url":"https://api.github.com/repos/edx/edx-platform/pulls/7075","_links":{"self":{"href":"https://api.github.com/repos/edx/edx-platform/pulls/comments/25266853"},"html":{"href":"https://github.com/edx/edx-platform/pull/7075#discussion_r25266853"},"pull_request":{"href":"https://api.github.com/repos/edx/edx-platform/pulls/7075"}}},"pull_request":{"url":"https://api.github.com/repos/edx/edx-platform/pulls/7075","id":29834830,"html_url":"https://github.com/edx/edx-platform/pull/7075","diff_url":"https://github.com/edx/edx-platform/pull/7075.diff","patch_url":"https://github.com/edx/edx-platform/pull/7075.patch","issue_url":"https://api.github.com/repos/edx/edx-platform/issues/7075","number":7075,"state":"open","locked":false,"title":"WIP: Fix issue PLAT-452: Draft block showing as 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