Fix possible unbound error of where_clause in delete method of Chroma datastore#477

YoshiLoL0526 wants to merge 1 commit intoopenai:mainopenai/chatgpt-retrieval-plugin:mainfrom

YoshiLoL0526:bugfix/possible-unbound-chroma-datastoreYoshiLoL0526/chatgpt-retrieval-plugin:bugfix/possible-unbound-chroma-datastoreCopy head branch name to clipboard