Remove "this==NULL" and adjust corresponding callers

core/src/fpdfapi/fpdf_page/fpdf_page.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/fpdfapi/fpdf_page.h"
 #include "../../../include/fpdfapi/fpdf_module.h"
 #include "pageint.h"
 void CPDF_PageObject::Release()
@@ skipping 823 matching lines @@
     m_pDocument = (CPDF_Document*)pDocument;
     m_pFormDict = pPageDict;
     if (bPageCache) {
         m_pPageRender = CPDF_ModuleMgr::Get()->GetRenderModule()->CreatePageCache(this);
     }
     if (pPageDict == NULL) {
         m_PageWidth = m_PageHeight = 100 * 1.0f;
         m_pPageResources = m_pResources = NULL;
         return;
     }
-    m_pResources = GetPageAttr(FX_BSTRC("Resources"))->GetDict();
+    CPDF_Object* pageAttr = GetPageAttr(FX_BSTRC("Resources"));
+    m_pResources = pageAttr ? pageAttr->GetDict() : NULL;
     m_pPageResources = m_pResources;
     CPDF_Object* pRotate = GetPageAttr(FX_BSTRC("Rotate"));
     int rotate = 0;
     if (pRotate) {
         rotate = pRotate->GetInteger() / 90 % 4;
     }
     if (rotate < 0) {
         rotate += 4;
     }
     CPDF_Array* pMediaBox, *pCropBox;
@@ skipping 84 matching lines @@
     }
 }
 CPDF_Object* CPDF_Page::GetPageAttr(FX_BSTR name) const
 {
     return FPDFAPI_GetPageAttr(m_pFormDict, name);
 }
 CPDF_Form::CPDF_Form(CPDF_Document* pDoc, CPDF_Dictionary* pPageResources, CPDF_Stream* pFormStream, CPDF_Dictionary* pParentResources)
 {
     m_pDocument = pDoc;
     m_pFormStream = pFormStream;
-    m_pFormDict = pFormStream->GetDict();
+    m_pFormDict = pFormStream ? pFormStream->GetDict() : NULL;
     m_pResources = m_pFormDict->GetDict(FX_BSTRC("Resources"));
     m_pPageResources = pPageResources;
     if (m_pResources == NULL) {
         m_pResources = pParentResources;
     }
     if (m_pResources == NULL) {
         m_pResources = pPageResources;
     }
     m_Transparency = 0;
     LoadTransInfo();
@@ skipping 78 matching lines @@
     matrix = m_PageMatrix;
     matrix.Concat(display_matrix);
 }
 CPDF_ParseOptions::CPDF_ParseOptions()
 {
     m_bTextOnly = FALSE;
     m_bMarkedContent = TRUE;
     m_bSeparateForm = TRUE;
     m_bDecodeInlineImage = FALSE;
 }