Update Chat.svelte error handling of previous message

related to this discussion: https://github.com/open-webui/open-webui/discussions/10034. in some cases the previous message have error but it still generate a response. in such case we should also next round chat. so I update the if condition to add another checking of the content in previous message.

src/lib/components/chat/Chat.svelte

@@ -1241,7 +1241,7 @@
 			// Response not done
 			return;
 		}
-		if (messages.length != 0 && messages.at(-1).error) {
+		if (messages.length != 0 && messages.at(-1).error && !messages.at(-1).content) {
 			// Error in response
 			toast.error($i18n.t(`Oops! There was an error in the previous response.`));
 			return;