[Origin] axes without lines are not imported

The projectsingle_layer_two_axes_without_lines.opj has 4 axes in total (2 for x and 2 for y) whereas the second axes don't have any line and have labels only:

We don't read the second axes:

In the code we're using originXAxis.formatAxis[1].hidden in https://invent.kde.org/education/labplot/-/blame/master/src/backend/datasources/projects/OriginProjectParser.cpp?page=2#L1280 to check whether the axis is visible or not and we only go into loadAxis() if hidden == false which is not the case here.

In this case the axis, consisting of multiple building blocks like the line and labels is visible but only a part of it, namely the line, is not visible. We need to figure out how to read this properly