bug#33227: 25.1; auctex: tex.el: TeX-local-master-p does not check if complete local variable block is valid

[Jan Luca Naumann]

Dear emacs- and auctex-maintainers,

if the local variable block is not valid (for example due to a typo in
"Local Variables") the function TeX-local-master-p will create the wrong
result that TeX-master is set locally although it is not read from the
variables block. Maybe the heuristic in TeX-local-master-p should be
improved if the local variables are loaded correctly, otherwise the
complete process will fail for example in TeX-master-file-ask with the
error "Master file already set".

Thank you for your help and best regards,
Jan

In GNU Emacs 25.1.1 (x86_64-pc-linux-gnu, GTK+ Version 3.22.11)
 of 2017-09-15, modified by Debian built on trouble
Windowing system distributor 'The X.Org Foundation', version 11.0.11902000
System Description:     Debian GNU/Linux 9.5 (stretch)

Configured using:
 'configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-pop=yes
 
--enable-locallisppath=/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.1/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-pop=yes
 
--enable-locallisppath=/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.1/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --with-x=yes --with-x-toolkit=gtk3
 --with-toolkit-scroll-bars 'CFLAGS=-g -O2
 -fdebug-prefix-map=/build/emacs25-wN2qS3/emacs25-25.1+1=.
-fstack-protector-strong
 -Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
 -D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LC_ALL: de_DE.utf-8
  value of $LANG: de_DE.utf-8
  locale-coding-system: utf-8

Major mode: Emacs-Lisp

Minor modes in effect:
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  auto-fill-function: yas--auto-fill
  transient-mark-mode: t

Recent messages:
Applying style hooks...done
mwheel-scroll: End of buffer [5 times]
Auto-saving...done
Auto-saving...done
Compiling label environment definitions...done
ref: info not available, use ‘M-x reftex-view-crossref’ to get it.
Quit [2 times]
C-x C-g is undefined
Quit
Mark saved where search started

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