refac: only generate tags when content is non-empty

src/lib/components/chat/Messages/ResponseMessage.svelte

@@ -529,7 +529,7 @@
 		if (!details) {
 			showRateComment = true;
 
-			if (!updatedMessage.annotation?.tags) {
+			if (!updatedMessage.annotation?.tags && (message?.content ?? '') !== '') {
 				// attempt to generate tags
 				const tags = await generateTags(localStorage.token, message.model, messages, chatId).catch(
 					(error) => {