Soft handling of situations where a configuration file or alias does not exist

[obervinov]

• configs.json does not exist

  =========================== short test summary info ============================
  ERROR tests/test_create_inline_markup.py::test_extract_token - FileNotFoundError: [Errno 2] No such file or directory: 'configs/messages.json'
  ERROR tests/test_create_inline_markup.py::test_create_inline_markup_3 - FileNotFoundError: [Errno 2] No such file or directory: 'configs/messages.json'
  ERROR tests/test_create_inline_markup.py::test_create_inline_markup_4 - FileNotFoundError: [Errno 2] No such file or directory: 'configs/messages.json'

• alias not found
  just send error in the log message

• configs.json is empty

  =========================== short test summary info ============================
  ERROR tests/test_create_inline_markup.py::test_extract_token - json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
  ERROR tests/test_create_inline_markup.py::test_create_inline_markup_3 - json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
  ERROR tests/test_create_inline_markup.py::test_create_inline_markup_4 - json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)