[TC][Admin/Main StreetCode block][API] Verify that Admin is unable to create "History-код" if "teaser" field is missing (API via Postman).

[Viacheslav-QC]

Priority: High

Preconditions:

1. Open Postman and login as Admin;
2. Create method POST with next endpoint: " https://backend.historycode.online/api/Streetcode/Create ";
3. Open test case: # 2668 take the request body as an example.

Steps to reproduce

1. Leave the "teaser" field empty;
2. Execute the request.

Expected result 400 Bad Request and "message": "Поле 'Тизер' не може бути пусте".

Postconditions Delete "History-код" and images that were created.

User story: #115

Related bug: