Empty lines + pgfplotstableread does not work

[f380cedric]

Hello,

Using pgfplotstableread to load a csv seems to disable the default behavior of empty lines, which in a usual 2D plot is jump.
Is it expected?

MWE

\documentclass[]{standalone}
\usepackage{pgfplots,pgfplotstable} 
\pgfplotsset{compat=newest}

\begin{filecontents}{data1.txt}
-1 -1
0 0

1 1
2 2
\end{filecontents}
\begin{document}
\begin{tikzpicture}
\begin{axis}

  \addplot [color=black] table[x index =0, y index = 1,]   {./data1.txt}; 


\end{axis}
\end{tikzpicture}

\begin{tikzpicture}
\pgfplotstableread[x index =0, y index = 1]{data1.txt}{\mytable}
\begin{axis}

  \addplot [color=black] table {\mytable}; 

\end{axis}
\end{tikzpicture}
\end{document}