[BUG] MCQ/MTC newline causes chat widget to hang

[matKlju]

Bug description:
When a service contains newline characters inside Message To Client (MTC) or Multiple Choice Question (MCQ) blocks/ elements, the response does not appear in the chat widget.
The chat widget remains loading / hanging instead of displaying the response.

This prevents services that include formatted text (with line breaks) from completing normally.

Expected behavior:
Services support newline characters in Message To Client (Sõnum kliendile – MTC) and Multiple Choice Question (MCQ) messages.
The chat widget should correctly render responses containing newline characters and display the message/options without remaining in a loading or hanging state.

Screenshots:

Request: {method: POST, url: /backoffice/hbs/bot_responses_to_messages, params: {}, query: {}, body: {"data":{"authorLastName":"","chatId":"2e25f76e-74a7-4d66-a908-ffe094b2dd8a","botMessages":[{"text":"asd\n\nasd","recipient_id":"2e25f76e-74a7-4d66-a908-ffe094b2dd8a"}],"authorFirstName":"","created":"2026-03-04T13:31:30.101Z","authorTimestamp":"2026-03-04T13:31:30.101Z","authorId":"chatbot"}}} err: SyntaxError: Bad control character in string literal in JSON at position 77 at JSON.parse (<anonymous>) at /workspace/app/server.js:139:31 at ExpressHandlebars.<anonymous> (/workspace/app/node_modules/express-handlebars/dist/express-handlebars.js:301:25) at step (/workspace/app/node_modules/express-handlebars/dist/express-handlebars.js:49:23) at Object.next (/workspace/app/node_modules/express-handlebars/dist/express-handlebars.js:30:53) at fulfilled (/workspace/app/node_modules/express-handlebars/dist/express-handlebars.js:21:58) Response: {statusCode: 200, responseData: "{\"error\":\"There was an error executing /workspace/app/module/backoffice/hbs/bot_responses_to_messages.handlebars\"}"}

Additional information:

The issue appears when the service returns text containing newline characters, which seems to break the chat widget response rendering.

[matKlju]

buerokratt/Buerokratt-Chatbot#1823

[matKlju]

AT- passed . Works- as expected!