I'm downloding metadata from items in ArcGIS Online. For that to happen it is required that the 'Metadata" keyword is in the typeKeywords list. I'm updating this keyword when not found. Anyway some items will return None when you try to access their metadata. I went online and tried to visualize the metadata and got the error bellow:
Unable to transform metadata for item '6941bae88d6c44d89fb0c68b647c3644'