In the following diagram, it is not possible to drag Y on to the end of the arrow, despite it being empty.

In such a situation, it makes sense to allow Y to be dragged on top of the empty node.

ConstantLine was introduced in 2018b:
https://de.mathworks.com/help/matlab/ref/matlab.graphics.chart.decoration.constantline-properties.html

when using for example:
xline(4)
This error appears:
`Error using matlab2tikz>handleAllChildren (line 730)
I don't know how to handle this object: constantline
Error in matlab2tikz>drawAxes (line 880)
[m2t, childrenEnvs] = handleAllChildren(m2

I did a workaround like presented on Stack-Overflow:

\documentclass[convert = false, border=10pt,]{standalone}
\usepackage[siunitx, straightvoltages]{circuitikz}

\def\CalcC#1{%
\coordinate (base) at (#1.B);
\coordinate (collector) at (#1.C);
\coordinate (emitter) at (#1.E);
\draw (barycentric cs:b