Remove "this==NULL" and adjust corresponding callers

fpdfsdk/src/fpdfppo.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
  
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "../include/fpdfppo.h"
 #include "../include/fsdk_define.h"
 
 class CPDF_PageOrganizer
@@ skipping 46 matching lines @@
 #endif
         DInfoDict->SetAt("Producer", new CPDF_String(producerstr));
 
         //Set type////////////////////////////////////////////////////////////////
         CFX_ByteString cbRootType = pNewRoot->GetString("Type","");
         if( cbRootType.Equal("") )
         {
                 pNewRoot->SetAt("Type", new CPDF_Name("Catalog"));
         }
         
-        CPDF_Dictionary* pNewPages = (CPDF_Dictionary*)pNewRoot->GetElement("Pages")->GetDirect();
+        CPDF_Dictionary* pNewPages = (CPDF_Dictionary*)(pNewRoot->GetElement("Pages")? pNewRoot->GetElement("Pages")->GetDirect() : NULL);
         if(!pNewPages)
         {
                 pNewPages = new CPDF_Dictionary;
                 FX_DWORD NewPagesON = pDestPDFDoc->AddIndirectObject(pNewPages);
                 pNewRoot->SetAt("Pages", new CPDF_Reference(pDestPDFDoc, NewPagesON));
         }
         
         CFX_ByteString cbPageType = pNewPages->GetString("Type","");
         if(cbPageType.Equal(""))
         {
@@ skipping 226 matching lines @@
         size_t dwNewObjNum = 0;
         
         pMapPtrToPtr->Lookup((FX_LPVOID)dwObjnum, (FX_LPVOID&)dwNewObjNum);
         if(dwNewObjNum)
         {
                 return (int)dwNewObjNum;
         }
         else
         {
                 CPDF_Object* pClone  = pRef->GetDirect()->Clone();
-                if(!pClone)                     return 0;
+                if(!pClone)                     
+                        return 0;
                 
                 if(pClone->GetType() == PDFOBJ_DICTIONARY)
                 {
                         CPDF_Dictionary* pDictClone = (CPDF_Dictionary*)pClone;
                         if(pDictClone->KeyExist("Type"))
                         {
                                 CFX_ByteString strType = pDictClone->GetString("Type");
                                 if(!FXSYS_stricmp(strType, "Pages"))
                                 {
                                         pDictClone->Release();
@@ skipping 126 matching lines @@
         if(!pSrcDict)
                 return FALSE;
         CPDF_Document* pDstDoc = (CPDF_Document*)dest_doc;
         CPDF_Dictionary* pDstDict = pDstDoc->GetRoot();
         if(!pDstDict)
                 return FALSE;
         pDstDict->SetAt(FX_BSTRC("ViewerPreferences"), pSrcDict->Clone(TRUE));
         return TRUE;
 }