[poppler] Marked content, Gfx.cc

[Adrian Johnson]

Albert Astals Cid wrote:
> This patch can not be 	added as is as it will cause TextOutputDev to crash 
> since it uses the properties dictionary assuming it won't be null.
> 
> Adrian can you have a look and tell me if we should just convert
> 
>   if (properties->lookup("ActualText", &obj)) {
> to
>   if (properties && properties->lookup("ActualText", &obj)) {

Looks ok to me.