[O] Bug: missing language for code block results in failure [9.1.14 (9.1.14-dist @ .../org/install/emacs/site-lisp/org/)]

[John Ciolfi]

Hi

I ran into a confusing error due to missing language for a code block. Given 
attached issue.org
which contains:

    #+BEGIN_SRC
      if (a > 1) {
      }
    #+END_SRC

if you convert to pdf using the attached issue_repro.el via:

  emacs --batch -L /path/to/org/install/emacs/site-lisp/org -l issue_repro.el

where /path/to/org/install/emacs/site-lisp/org is version 9.1.14 and I'm 
running emacs 25.1.1,
you'll see this error

  $ emacs --batch -L 
/local-ssd/ciolfi/sbtools/apps/emacs-add-ons/install-25/org/install/emacs/site-lisp/org
 -l issue_repro.el
  Loading 00debian-vars...
  :
  Debug on Error enabled globally
  Debugger entered--Lisp error: (wrong-type-argument stringp nil)
    intern(nil)
    org-latex-src-block((src-block .....
    <snip>

Could this be handled more gracefully?

Thanks
John


Emacs  : GNU Emacs 25.1.1 (x86_64-pc-linux-gnu, GTK+ Version 3.22.11)
 of 2017-09-15, modified by Debian
Package: Org mode version 9.1.14 (9.1.14-dist @ 
.../org/install/emacs/site-lisp/org/)


Code block is missing the language:

  #+BEGIN_SRC
    if (a > 1) {
    }
  #+END_SRC

issue_repro.el
Description: application/emacs-lisp