Git exception should be more specific

Hi Jiahui_Song, thanks for flagging this. The notebook-content.py part of the error does suggest the file in the repo has extra text after the JSON, which is often a leftover merge conflict marker or a manual edit. Opening that file in the Git repo and checking the end of it can usually pinpoint the problem for now. A more specific message with the item name and line would clearly help, so it is worth adding as an idea on Fabric Ideas where others can vote on it. 

AI-assisted drafting: AI was used to help structure and phrase this response. I reviewed and validated the technical content before posting.