instead of assert()'ing, just acts like a Document and delete the pixmap request

svn path=/branches/KDE/4.0/kdegraphics/okular/; revision=769282

core/generator.cpp

@@ -318,7 +318,9 @@ void Generator::signalPixmapRequestDone( PixmapRequest * request )
     if ( d->m_document )
         d->m_document->requestDone( request );
     else
-        Q_ASSERT( !"No document set for generator in signalPixmapRequestDone!" );
+    {
+        delete request;
+    }
 }
 
 const Document * Generator::document() const