[poppler] PDFDoc->writeTrailer

[Axel Strübing]

Dear popplers

there seems to be a glitch in PDFDoc::writeTrailer.

For incremental updates 
if(xref->getTrailerDict()->getDict()->lookup("ID", &obj4) != NULL) {
is checked but this call never returns NULL but a pointer to Object (the 
Object being the NullObject or whatever)

IMHO the correct line would be:
if( ! xref->getTrailerDict()->getDict()->lookup("ID", &obj4)->isNull() ) {

This saved me the observed warning.
I attach a the patch to PDFDoc.cc.

Please correct me if I am wrong and waisted someones time.
--
regards
Axel
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