fix: Add meaningful alert error message if file upload fails (#3093)

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/javascript/dashboard/store/modules/conversations/actions.js

@@ -155,6 +155,7 @@ const actions = {
   },
 
   sendMessage: async ({ commit }, data) => {
+    // eslint-disable-next-line no-useless-catch
     try {
       const pendingMessage = createPendingMessage(data);
       commit(types.default.ADD_MESSAGE, pendingMessage);
@@ -164,7 +165,7 @@ const actions = {
         status: MESSAGE_STATUS.SENT,
       });
     } catch (error) {
-      // Handle error
+      throw error;
     }
   },