LaTeX export: Fix protection bug
Sebastian Rose writes:
> The following code does not work as expected, when exported to PDF:
>
> => --->8----------------------------->8----------------------------->8---
> * Image basics
>
> Images are inserted into an Org file in a fashion similar to links:
> : [[file:///home/sebastian/develop/org/org-mode-unicorn.png]]
>
> <= ---8<-----------------------------8<-----------------------------8<---
>
> Result:
>
> The last line is exported as:
>
> \href{file:///home/sebastian/develop/org/org-mode-unicorn.png}{nil}
>
>
> Expected result:
>
> I expect the last line to be exported as fixed width text.
>