fix: extend empty assistant message filter to _query_stream and add empty-list coverage#7723

lingyun14beta wants to merge 7 commits intoAstrBotDevs:masterAstrBotDevs/AstrBot:masterfrom

lingyun14beta:fix/empty-assistant-message-query-streamlingyun14beta/AstrBot:fix/empty-assistant-message-query-streamCopy head branch name to clipboard