[closed] pgfplotstable: Wie wende ich eine if-Methode in 'preproc/expr' an? (Konflikt mit 'string type'?)

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\documentclass[border=2pt]{standalone}
\usepackage{pgfplotstable}
\begin{document}
\pgfplotstableset{
columns/1/.style={
% geht:
preproc/expr={##1==0 ? "111" : "##1"},
% geht nicht:
%preproc/expr={##1==0 ? "{}" : "##1"},
%string type,
},
}
IST: \pgfplotstabletypeset[]{
1    1 
2    {}
3    0 
4    4
5    0
6    5
7    6
}
SOLL: \begin{tabular}{r r} 
1  &  1           \\
2  &  {}           \\
3  &  {}           \\ 
4  &  4           \\
5  &  {}           \\
6  &  5           \\
7  &  6           \\
\end{tabular}
\end{document}
 
 
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