Wie kann ich bei datatool Listenelemente ausschließen?

\documentclass[12pt, pointednumbers]{scrartcl}
\usepackage[utf8]{inputenc}
 \usepackage{selinput}
 \SelectInputMappings{adieresis={ä},  germandbls={ß}}
\usepackage[T5, T1, LY1, LTH, TS1, LAE]{fontenc}
%\usepackage[utf8]{inputenx}
%
\usepackage[ngerman]{babel}

\usepackage{datatool}
\usepackage{xcolor}
\usepackage{hyperref}

%Überschriften
\setkomafont{disposition}{\normalcolor\usefont{T1}{lmtt}{\bfdefault}{n}}%\bfseries\ttfamily

\newcommand{\ABC}{%
ABCDEFGHIJKLMNOPQURSTUVWYZ Ä Ö Ü \par
           abcdefghijklmnopqrstuvwxyz ä ö ü ß\par
           0123456789\par
 .,:;-!" '\$\%\&/@\_\S\#\textasciitilde\textbackslash\textless\textgreater[]\{\}() 
}

\usepackage{filecontents}

\begin{filecontents}{mydata.csv}
T1     pag  b      n      C:/texlive/
C19 fs  b   it
C19 fs  b   n
C19 fs  b   m
LTH    waree    b      it     C:/texlive/
U      bla  n   m
OML   zpple   bx      it   C:/texlive/
LY1    zlmtt   lc        it   C:/texlive/  
T5      zlmtt   bx      it   C:/texlive/
\end{filecontents}

\DTLsetseparator{ }
\DTLloaddb[
  noheader,
   keys={encoding,family,series,shape,adress}
  ]{mydb}{mydata.csv}

\begin{document}

%\tableofcontents
%\newpage

\DTLforeach*{mydb}{\encoding=encoding, \family=family, \series=series, \shape=shape, \adress=adress}{%
  \section[\textbackslash usefont\{\encoding\}\{\family\}\{\series\}\{\shape\}]{\textbackslash usefont\{\encoding\}\{\family\}\{\series\}\{\shape\} \\
\footnotesize{found in:  \adress}}

\begingroup
%\inputencoding{\encoding}
 \usefont{\encoding}{\family}{\series}{\shape}
 \ABC
\endgroup
}
\end{document}