René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Update of metadata fails when dataset contains files","articleBody":"I am trying to update the metadata of a dataset. It works fins as long as the dataset does not contain any files. When the dataset contains files, I receive:\r\n\r\n```\r\nIn [34]: dataset.update_metadata(metadata)\r\n---------------------------------------------------------------------------\r\nOperationFailedError                      Traceback (most recent call last)\r\n\u003cipython-input-34-035088be5019\u003e in \u003cmodule\u003e()\r\n----\u003e 1 dataset.update_metadata(metadata)\r\n\r\n/home/admincentos/src/dataverse/dataverse/dataset.pyc in update_metadata(self, metadata)\r\n    236\r\n    237         if resp.status_code != 200:\r\n--\u003e 238             raise OperationFailedError('JSON metadata could not be updated.')\r\n    239\r\n    240         updated_metadata = resp.json()['data']\r\n\r\nOperationFailedError: JSON metadata could not be updated.\r\n```\r\nThe http request fails with error code 500:\r\n\r\n```\r\nresp = requests.put(\r\n    url,\r\n    headers={'Content-type': 'application/json'},\r\n    data=json.dumps(md),\r\n    params={'key': dataset.connection.token}\r\n)\r\n\r\nprint resp.status_code, resp.reason\r\n500 Internal Server Error\r\n```\r\n","author":{"url":"https://github.com/chStaiger","@type":"Person","name":"chStaiger"},"datePublished":"2018-04-25T15:45:25.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/48/dataverse-client-python/issues/48"}