Remove "this==NULL" and adjust corresponding callers

core/src/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp

Index: core/src/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp
diff --git a/core/src/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp b/core/src/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp
index 8cd9f2bdb5d105c831dd8eefbf0f3e62351a9519..fe5e59c6986d82fb855e300534db8a8aaae3fd34 100644
--- a/core/src/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp
+++ b/core/src/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp
@@ -91,7 +91,7 @@ void CPDF_StreamContentParser::Handle_BeginImage()
         CPDF_Object* pObj = m_pSyntax->ReadNextObject();
         if (!key.IsEmpty()) {
             pDict->SetAt(key, pObj, m_pDocument);
-        } else {
+        } else if (pObj) {
             pObj->Release();
         }
     }
@@ -1064,7 +1064,7 @@ void CPDF_ContentParser::Continue(IFX_Pause* pPause)
             } else {
                 CPDF_Array* pContent = m_pObjects->m_pFormDict->GetArray(FX_BSTRC("Contents"));
                 m_pStreamArray[m_CurrentOffset] = FX_NEW CPDF_StreamAcc;
-                CPDF_Stream* pStreamObj = (CPDF_Stream*)pContent->GetElementValue(m_CurrentOffset);
+                CPDF_Stream* pStreamObj = (CPDF_Stream*)(pContent ? pContent->GetElementValue(m_CurrentOffset) : NULL);
                 m_pStreamArray[m_CurrentOffset]->LoadAllData(pStreamObj, FALSE);
                 m_CurrentOffset ++;
             }