Fix parsing with 'indent'

[sea5kg]

from issue #33

with open(path, 'w') as f:
 yaml.dump(a_dict, f,  default_flow_style=False, sort_keys=False)

generate result like:
std::string sTest =     
        "'2021-10-08':\n"
        "-code: '300209'\n"
        " focusstr: ''\n"
        "-code: '300047'\n"
        " focusstr: ''\n"
        "-code: '300970'\n"
        " focusstr: ''\n"
        "-code: '300288'\n"
        " focusstr: ''\n"
        "'2021-10-11':\n"
        "-code: '300162'\n"
        " focusstr: ''\n"
        "-code: '300209'\n"
        " focusstr: ''\n"
        "-code: '300972'\n"
        " focusstr: ''\n"
        "-code: '300159'\n"
        " focusstr: ''\n"
    ;

Prepared test test_python_yaml_issue_33.cpp