add empty text on empty value chat

src/frontend/src/constants/constants.ts

@@ -858,3 +858,5 @@ export const ERROR_UPDATING_COMPONENT =
   "An unexpected error occurred while updating the Component. Please try again.";
 export const TITLE_ERROR_UPDATING_COMPONENT =
   "Error while updating the Component";
+
+  export const EMPTY_INPUT_SEND_MESSAGE = "No input message provided.";

src/frontend/src/modals/IOModal/components/chatView/chatMessage/index.tsx

@@ -14,6 +14,7 @@ import useFlowStore from "../../../../../stores/flowStore";
 import { chatMessagePropsType } from "../../../../../types/components";
 import { classNames, cn } from "../../../../../utils/utils";
 import FileCardWrapper from "./components/fileCardWrapper";
+import { EMPTY_INPUT_SEND_MESSAGE } from "../../../../../constants/constants";
 
 export default function ChatMessage({
   chat,
@@ -310,7 +311,9 @@ export default function ChatMessage({
             ) : (
               <div className="flex flex-col">
                 <span
-                  className="prose text-primary word-break-break-word dark:prose-invert"
+        className={`prose word-break-break-word dark:prose-invert ${
+          chatMessage === EMPTY_INPUT_SEND_MESSAGE ? "text-gray-400" : "text-primary"
+        }`}
                   data-testid={
                     "chat-message-" + chat.sender_name + "-" + chatMessage
                   }

src/frontend/src/modals/IOModal/components/chatView/index.tsx

@@ -4,6 +4,7 @@ import { Button } from "../../../../components/ui/button";
 import {
   CHAT_FIRST_INITIAL_TEXT,
   CHAT_SECOND_INITIAL_TEXT,
+  EMPTY_INPUT_SEND_MESSAGE,
 } from "../../../../constants/constants";
 import { deleteFlowPool } from "../../../../controllers/API";
 import useAlertStore from "../../../../stores/alertStore";
@@ -79,9 +80,7 @@ export default function ChatView({
           return {
             isSend: !is_ai,
             message:
-              message === "" || !message
-                ? "No input message provided."
-                : message,
+              message === "" || !message ? EMPTY_INPUT_SEND_MESSAGE : message,
             sender_name,
             componentId: output.id,
             stream_url: stream_url,