Missing character / nullfont - Meldung durch tikz

Die Meldung kam schon im Beispiel aus der Frage selbst und liegt daran, dass an der Stelle kein +0.1pt erlaubt ist. Wie der Erklärung zu tikzpicutre in Abschnitt 12.2.1 der Anleitung zu entnehmen ist, schaltet TikZ für tikzpicture temporär den Font auf \nullfont um, damit alle Textausgaben außerhalb von den Stellen, an denen sie erlaubt sind, unterbunden werden. So würde beispielsweise mit:

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  \pgfsetlinewidth{0.4pt}
  \pgfpathmoveto{\pgfqpoint{0pt}{0pt}}Butter
  \pgfpathlineto{\pgfqpoint{\LineSpace+0.1pt}{\LineSpace+0.1pt}}
  \pgfusepath{stroke}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

ebenfalls kein Butter ausgegeben, sondern in der log-Datei:

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Missing character: There is no B in font nullfont!
Missing character: There is no u in font nullfont!
Missing character: There is no t in font nullfont!
Missing character: There is no t in font nullfont!
Missing character: There is no e in font nullfont!
Missing character: There is no r in font nullfont!
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

gemeldet.

Beseitigen kann man das einfach, indem man das wirkungslose +0.1pt an der Stelle weglässt oder beispielsweise

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\documentclass[12pt]{article}
\usepackage{tikz}
\usetikzlibrary{patterns}
\makeatletter
\pgfdeclarepatternformonly[\LineSpace]{my north east lines}{\pgfqpoint{-1pt}{-1pt}}{\pgfpoint{\LineSpace+0.2pt}{\LineSpace+0.2pt}}{\pgfqpoint{\LineSpace}{\LineSpace}}%
{
  \pgfsetcolor{\tikz@pattern@color}
  \pgfsetlinewidth{0.4pt}
  \pgfpathmoveto{\pgfqpoint{0pt}{0pt}}
  \pgfpathlineto{\pgfqpoint{\dimexpr\LineSpace+0.1pt}{\dimexpr\LineSpace+0.1pt}}
  \pgfusepath{stroke}
}
\newdimen\LineSpace
\tikzset{
  line space/.code={\LineSpace=#1},
  line space=3pt
}
\makeatother
\begin{document}
  \begin{tikzpicture}
    \draw[red,fill,pattern color=blue,line space=10pt,pattern=my north east lines] (0,0) rectangle (2,3);
  \end{tikzpicture}
\end{document}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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verwendet. Besser wäre vermutlich, die Coordinaten erst mit \pgfmathparse zu berechnen und einer Variablen zuzuweisen und dann diese zu verwenden. Aber ich kenne mich mit TikZ nicht so besonders aus.