traceback on sprint/board misconfig

[lukaszachy]

messed up config -> missing 'board' and using 'sprint: active' but newa should not traceback

  File "/usr/lib/python3.13/site-packages/click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
  File "/usr/lib/python3.13/site-packages/click/decorators.py", line 45, in new_func
    return f(get_current_context().obj, *args, **kwargs)
  File "/usr/lib/python3.13/site-packages/newa/cli.py", line 801, in cmd_jira
    new_issue = jira_handler.create_issue(
        action,
    ...<6 lines>...
        transition_processed=transition_processed,
        fields=rendered_fields)
  File "/usr/lib/python3.13/site-packages/newa/__init__.py", line 1692, in create_issue
    sprint_id = self.sprint_cache['active'][0]
                ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^
IndexError: list index out of range