missing character in nullfont with seminar.cls

[pgf-tikz-bot]

Migrated from SourceForge
Author: milde
Timestamp: 2016-09-22 20:46:40.078000

The current version of the seminar slides class uses pgf instead of the former pstricks for slide rotation. Even the simplest seminar document

\documentclass{seminar}
\begin{document}
test
\end{document}

reports missing characters after loading pgfmathutil.code.tex:

...
(/usr/share/texlive/texmf-dist/tex/generic/pgf/math/pgfmathutil.code.tex
Missing character: There is no 0 in font nullfont!
Missing character: There is no . in font nullfont!
Missing character: There is no 0 in font nullfont!
Missing character: There is no p in font nullfont!
Missing character: There is no t in font nullfont!
...

This is similar to bug 314 but still present in TeXLive 2016.
Seems to be caused by line 23 (in Version 1.414213 29/9/2007)

\def\pgfmath@ensureregister#1#2{%
	\begingroup%
	\setbox0=\hbox\bgroup\begingroup% In case #2 is a defined macro. Unlikely, but you never know...
		\afterassignment\pgfmath@@ensureregister%
		\noexpand#20.0pt\let\pgfmath@temp\relax\relax\pgfmath@#2#1\pgfmath@}

[pgf-tikz-bot]

Migrated from SourceForge
Author: mo-gul
Timestamp: 2018-12-23 21:51:08.226000

• Description has changed:

Diff:

--- old
+++ new
@@ -1,11 +1,11 @@
-The current version of the "seminar" slides class uses pgf instead of the former pstricks for slide rotation. Even the simplest seminar document 
+The current version of the `seminar` slides class uses `pgf` instead of the former `pstricks` for slide rotation. Even the simplest seminar document 
 ```
 \documentclass{seminar}
 \begin{document}
 test
 \end{document}
 ```
-reports missing characters after loading pgfmathutil.code.tex:
+reports missing characters after loading `pgfmathutil.code.tex`:
 ```
 ...
 (/usr/share/texlive/texmf-dist/tex/generic/pgf/math/pgfmathutil.code.tex
@@ -17,7 +17,7 @@
 ...
 ```
 
-This is similar to bug 314 but still present in TeXLive 2016.
+This is similar to [bug 314](https://sourceforge.net/p/pgf/bugs/314/) but still present in TeXLive 2016.
 Seems to be caused by line 23 (in Version 1.414213 29/9/2007)
 
 ```
@@ -27,4 +27,3 @@
 		\afterassignment\pgfmath@@ensureregister%
 		\noexpand#20.0pt\let\pgfmath@temp\relax\relax\pgfmath@#2#1\pgfmath@}
 ```
-