[O] bug in `org-export-string-as' when org-html-with-latex is set to dvipng

[Eric Schulte]

Evaluate the following to exercise the bug.

    ;; -*- emacs-lisp -*-
    (let ((org-html-with-latex 'dvipng))
      (org-export-string-as
       "\\begin{equation}\n\\frac{Eric}{Schulte}\n\\end{equation}\n" 'html t))

This functionality is required to port org-mime to the new exporting
backend.

Thanks,

-- 
Eric Schulte
http://cs.unm.edu/~eschulte